CarolloTechnicalProposal-STPUDSecondaryClarifierRehab071619
100 West Liberty Street, Suite 740, Reno, Nevada 89501
P. 775.324.4427
ͯͬͬ.ʹͰ.STPͬͬͰ | STPUDCoverLetterͬͳͭͲͭ͵.docx
July 16, 2019
Mr. Stephen Caswell, P.E.
South Tahoe Public Utility District
1275 Meadow Crest Drive
South Lake Tahoe, CA 96150
Subject: Proposal for Engineering Services for Secondary Clarifier Rehabilitation
Dear Mr. Caswell:
The Secondary Clarifiers are a critical link in the District’s activated sludge process. The three clarifiers, at
around 50 years old, are running up against their remaining useful lives. Improvements are needed to extend
the service lives of the clarifiers, reduce future maintenance costs, and improve process reliability. Project
challenges include the limited time available to fix Clarifier 1 (the clarifier in the worst condition), seasonal
timing constraints, sequencing to maintaining reliable process operation safely, and budgetary limitations.
We believe our team has a unique combination of attributes to make your project successful: previous work for
the District, a local team, and recent clarifier rehabilitation experience. Carollo has completed similar projects
for the cities of Richmond (through Veolia Water), Daly City, and San Jose, California, and the City of Dallas,
Texas.
The Carollo team was selected to apply focused expertise with secondary clarifier upgrades and pre-purchasing
of equipment. Key team member qualifications include:
Scott Parker – Principal-in-Charge (29 years of experience). Scott has completed several successful
projects for STPUD including the Big 5 Pump Station Condition Assessment, Twin Peaks Pump Station
and Water Line Replacement, and Headworks Replacement Project. He has built his career on providing
high quality designs for wastewater facilities throughout California, one of which included emergency
repairs to a secondary clarifier in Chico.
Mike Britten – Project Manager (45 years of experience). Mike relocated to the Reno office from our
Walnut Creek office. He recently completed his role as “liquids package” manager for the San Jose
Regional Wastewater Facility CIP, which included managing the $40 million nitrification clarifier
rehabilitation project. Prior to San Jose, Mike was responsible for several designs that involved secondary
clarifiers for the cities of Turlock, South San Francisco, Half Moon Bay, Daly City, and Richmond.
Richard (Ricky) Gutierrez – Project Engineer (15 years of experience). Ricky, also Reno-based, has a
broad range of experience with wastewater design and construction projects. Ricky recently completed his
role as project manager for the Sacramento Regional County Sanitation District Return Activated Sludge
(RAS) Pumping System Project. He was responsible for developing bid packages for pre-purchasing 48
individual RAS pumps that were turned over to the contractor for installation.
Thank you for the opportunity to continue providing services to STPUD. We are eager and ready to assist the
District in completing this important project. Please let us know if you have any questions concerning our
proposal or if you need any further information.
Carollo Engineers takes no exceptions to the District’s Standard Consulting Agreement.
Sincerely,
CAROLLO ENGINEERS, INC.
Michael J. Britten, P.E. Scott E. Parker, P.E., BCEE
Project Manager Principal-in-Charge
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TECHNICAL PROPOSAL
WATER AND WASTEWATER EXPERTS
Founded in 1933, Carollo
Engineers is an environmental
engineering firm specializing in
planning, design, and construction
management of wastewater and
water treatment facilities. We have provided these services
for improvements to treatment facilities ranging in size
from less than 1 mgd to more than 300 mgd in capacity.
Carollo’s sole focus is to provide water and wastewater
services for agencies such as yours. Because this is all we
do, our success is driven by our ability to provide
innovation and leadership in all of the areas that drive our
industry.
Cities, utilities, public agencies, and special districts of
all sizes count on Carollo to help them navigate the
increasingly complex challenges of cost-effectively and
sustainably protecting public health; meeting local, state,
and federal regulatory requirements; protecting the water
environment; and addressing public expectations. Our
core philosophy for success is to work collaboratively with
our clients to find the best ways to protect and enhance
our public water supplies and environment.
Carollo is a recognized leader in developing innovative
solutions to address wastewater related issues facing
public agencies. We have provided planning, design, and
construction-phase services for many new and improved
wastewater treatment facilities. Our experience includes:
•Facility planning/master planning
•Headworks facilities, including influent screening, grit
removal, and pumping
•Flow equalization
•Primary clarification and secondary clarification
•Secondary treatment using fixed film and suspended
growth treatment processes for BOD/ammonia removal
•Biological nitrogen and phosphorus removal
•Disinfection using chlorine gas, sodium hypochlorite,
low and medium-pressure ultraviolet (UV), and ozone
•Tertiary filtration
•Digester gas reuse (e.g., cogeneration)
•Biosolids pumping, thickening, digestion, dewatering,
and reuse
•Odor control facilities
Secondary Clarifi ers
Carollo has extensive experience in evaluating,
optimizing, and designing secondary clarifiers with similar
features outlined in your request for proposals (RFP).
These features include weir placement, weir and launder
cleaning systems, scum removal, optimization of square
and round clarifiers, and process assessment. We also have
experience with collector mechanism design, flocculating
well design, energy dissipation inlet design, and hydraulic/
density current assessments.
Some of the innovative tools and methods we use
to design, evaluate, and optimize secondary clarifier
performance include detailed hydraulic analysis,
computational fluid dynamic (CFD) modeling, stress
testing, velocity profile testing, and state point analysis to
assess and address clarification and thickening problems.
SAMPLE WORK PRODUCT
As requested, we have provided a sample work product
from the Richmond Wastewater Treatment Plant
Critical Improvements Project in Appendix A. This
project had elements similar to your Secondary Clarifier
Rehabilitation project and involved team members Scott
Parker, Mike Britten, and Mike Dadik. The first sample is
a Project Memorandum that summarizes the CFD model
results from an evaluation of increasing secondary clarifier
capacity. The second sample is a partial set of plans
depicting the scope of work for replacement of secondary
clarifier mechanisms and structural modifications.
RELEVANT AND RECENT PROJECTS
The table on the next page highlights some of Carollo’s
experience with secondary clarifier design. It is followed by
detailed descriptions and references for projects completed
within the last five years that are directly applicable to the
District’s Secondary Clarifier Rehabilitation. We invite
you to contact these references to verify Carollo’s quality
and responsiveness on similar projects.
1. Firm Experience
TECHNICAL PROPOSAL
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TECHNICAL PROPOSAL
Secondary Clarifi er Design Experience
Secondary Clarifi erRAS Conveyance and ControlWAS PumpingHydraulic Modeling/Flow SplitProcess ModelingCFD ModelingProject | Client Project
Cost
Richmond Wastewater Treatment Plant Critical Improvements | Veolia Water $4.5M
Secondary Clarifi er No. 5 and Denitrifi cation | City of Turlock, CA $18M
Water Pollution Control Plant Rehabilitation Reliability Upgrade | City of San Leandro, CA $41M
Temecula Valley Regional Water Reclamation Facility | Eastern Municipal Water District, CA $15M
Southwest Water Reclamation Facility Clarifi er Rehabilitation | Manatee County, FL $4M
Central Wastewater Treatment Plant Major Maintenance and Rehabilitation Improvements |
Dallas Water Utilities, TX
$19M
South San Francisco/San Bruno Water Quality Control Plant | City of South San Francisco, CA $30M
Secondary Treatment Facilities Expansion | Fairfi eld-Suisun Sewer District, CA $22M
Water Pollution Control Plant 12-mgd Expansion | City of Chico, CA $46M
Secondary Clarifi er Improvements | North San Mateo County Sanitation District, CA $31M
Secondary Treatment Improvements | Orange County Sanitation District, CA $8M
Pleasant Grove Wastewater Treatment Plant Expansion | City of Roseville, CA $31M
PAR 942 North Secondary Clarifi ers | Metro Wastewater Reclamation District, CO $55M
Fresno-Clovis Regional Wastewater Reclamation Facility Organic Upgrades| City of Fresno, CA $111M
Carollo provided design and engineering services during
construction for Veolia Water’s Critical Improvements
to the Richmond Wastewater Treatment Plant. Design
objectives included:
•Replace aging, failing, and inefficient facilities that
are essential to grit, BOD, and TSS removal
•Improve the wastewater treatment plant’s overall
reliability with respect to grit, BOD, and TSS
removal
•Reduce health and safety impacts to plant staff
Secondary clarifier improvements included
replacement of the secondary clarifier mechanisms and
structural modifications to optimize performance by
replacing infrastructure that was in very poor condition
and did not provide adequate, safe access to the
clarifiers. The project also included new screening and
grit removal improvements and aeration upgrades. A
fine screening system with mechanical bar screens and a
vortex grit removal system provides additional screening
of rags and debris that pass through to downstream
processes. Mechanical surface aerators were replaced
with a modern and energy-efficient diffused aeration
system. The upgrades resulted in improved secondary
clarifier process performance.
POINT OF CONTACT »Mr. Ryan Smith, Director of Water Resource
Recovery, Phone 510-620-5486
Email ryan_smith@ci.richmond.ca.us
COMPLETION DATE »June 2019
Richmond Wastewater Treatment Plant Critical Improvements, Veolia Water, CA
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TECHNICAL PROPOSAL
Secondary Clarifi er No. 5 and Denitrifi cation Facilities,
City of Turlock, CA
For more than 25 years, Carollo has assisted The City of
Turlock with design and construction of new facilities
to meet California Title 22 tertiary recycled water
requirements and to provide flexibility to discharge
domestic effluent to the river year-round or off site to
recycled water customers. Carollo has also completed
several permit-related projects, including NPDES
compliance study, effluent toxicity study, ammonia
toxicity study, THM reduction pilot-plant studies, and
alternative disinfection studies.
Carollo provided planning, design, construction
management, bidding services, and engineering services
during construction for a new (fifth) secondary
clarifier at Turlock’s Regional Water Quality
Control Facility to increase capacity and improve
secondary treatment performance. The $18 million
project converted seven aeration basins to achieve
denitrification of the plant effluent to meet the new
discharge permit limit for nitrate plus nitrite of 10 mg/L
(as N).
Other project design elements included a mixed liquor
flow distribution structure, return activated sludge
(RAS) pumping station and flow-paced RAS control,
scum pumping station, additions and modifications to
electrical and instrumentation systems, and associated
yard piping and paving and grading improvements.
Preliminary design included a detailed comparative
evaluation of recent clarifier technology improvements.
Carollo is now managing the construction and startup
for the project.
POINT OF CONTACT »Mr. Stephen Fremming, Project Manager
Phone 209-668-5599
Email sfremming@turlock.ca.us
COMPLETION DATE »July 2019
San Leandro Water Pollution Control Plant Rehabilitation,
City of San Leandro, CA
Carollo provided planning and design services for
$51 million in improvements to San Leandro’s Water
Pollution Control Plant to accommodate a dry weather
flow capacity of 7.6 mgd and a peak wet weather
flow capacity of 27.5 mgd. The project involved flow/
load estimates, analysis of unit process performance,
and condition assessment of various structures.
Design included raw sewage pumping, mechanical
screening/ handling, grit removal/processing/handling,
primary clarifiers, flow equalization facilities, odor
control, secondary clarifier rehabilitation, digester
rehabilitation, and other improvements. Project
highlights include:
•Improved aesthetics and odor control
•Reduced risk of sanitary sewer overflows by restoring
plant capacity and increasing wet weather capacity
•Simplified operations and maintenance by increasing
reliability and providing redundancy
•Maintained plant operations during construction by
phasing improvements and specifying shutdowns/
constraints in conjunction with plant operations
•Provided new LEED-certified administration building
for plant, operations, and laboratory personnel
•Ensured seamless project funding by securing a
low-interest State Revolving Fund loan
•Saved capital cost and ensured compact footprint
by implementing flow equalization and repurposing
abandoned tanks
POINT OF CONTACT »Mr. Justin Jensen, WPCP Plant Manager
Phone 510-577-3434
Email jjenson@sanleandro.org
COMPLETION DATE »September 2018
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TECHNICAL PROPOSAL
San Jacinto Valley Regional Water Reclamation Facility
Expansion, Eastern Municipal Water District, CA
Carollo provided planning, preliminary design, final
design, and construction services for a comprehensive
plant expansion to 14 mgd for the San Jacinto Valley
Regional Water Reclamation Facility, which had only
secondary treatment capabilities. The first project phase
involved design of $13.8 million in new secondary
effluent equalization and tertiary treatment facilities
to provide Title 22 approved reclaimed water. The
tertiary facilities included cloth-media disk filters, alum
chemical facility, and return water pump station. The
existing chlorine contact basins and effluent splitter
box were modified to provide contingency measures for
out-of-compliance effluent, as required by Title 22.
The subsequent Tertiary Treatment and Plant 2
project provided a new headworks facility with bar
screens and vortex-type grit removal system; two
100-foot-diameter circular primary clarifiers; aeration
basin for nitrification-denitrification; blower building;
three 125-foot-diameter circular secondary clarifiers;
primary sludge, RAS/WAS, and scum pumping;
secondary treatment polymer facility; additional
cloth-media type tertiary filters; tertiary chemical
building; flocculation basins; out-of-compliance and
tertiary effluent storage ponds; filter influent pump
station modifications/additions; utility water and tertiary
effluent pump station; aeration basins and WAS pump
station improvements; standby power generation facility;
chlorine contact tank; soil filter type foul air scrubbing
system; two return water pump stations; expansion of
biosolids handling processes; and a 10,000-square-foot
operations and maintenance building.
Southwest Water Reclamation Facility Clarifi er Rehabilitation,
Manatee County, FL
The Southwest Water Reclamation facility has a
permitted capacity of 22 mgd and has experienced
significant deterioration. The four secondary clarifiers’
mechanisms and headworks equipment are more than
20 years old and beyond their useful life. Much of the
equipment and concrete affiliated with the headworks is
deteriorated and in need of restoration or replacement,
and the scum ejector equipment for Clarifiers 3 and 4
are no longer operational. Carollo was retained to design
the following components:
•Rehabilitated headworks facility, including structural
rehabilitation, channel modifications, new screenings
conveyors, and new grit classifier and removal system
•New clarifier mechanisms and effluent launders for
Clarifiers 1 through 4
•New variable frequency drives for RAS Pump Nos. 2,
4, 5, and 6
•New scum pumping systems for Clarifier 3 and 4
•New electrical, instrumentation, and controls wiring
and conduits to support new/rehabilitated facilities
Carollo designed the project in multiple phases to allow
the plant to be in operation while improvements were
constructed. The headworks upgrades were designed
to maintain facility operation by isolating individual
channels. Replacement of the clarifiers’ mechanisms,
screenings conveyors, and grit classifiers dramatically
improved plant reliability and efficiency. New scum
pumps allowed the City to eliminate the scum wet
wells, which had been a source of odors and problematic
operations and maintenance. The new variable
frequency drives improved operational efficiency and
will prolong the life of the existing pumps.
POINT OF CONTACT »Mr. Jeff Streitmatter, Project Management
Division Manager, Phone 941-708-7450
Email jeff .streitmatter@mymanatee.org
COMPLETION DATE »December 2017
POINT OF CONTACT »Mr. Charles Bachmann, Assistant General
Manager of Engineering
Phone 951-928-3777
Email bachmannc@emwd.org
COMPLETION DATE »September 2015
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TECHNICAL PROPOSAL
From our discussions with the District, we have developed
an approach that will meet your long-term needs for
reliability and process performance. Our objective is
to collaborate with your operations and maintenance
(O&M) team to identify needed improvements and
prioritize them according to criticality, cost, and time
requirements. We will help the District develop a project
that makes business sense from a life-cycle perspective
and one that will not jeopardize continuous operation of
the secondary clarifiers and the District’s ability to meet
discharge permit requirements throughout the year.
PROJECT UNDERSTANDING
The District’s wastewater facility includes three secondary
clarifiers. Clarifier 1 is 53 years old and has been used
exclusively for conventional secondary sedimentation
of the mixed liquor process stream. Clarifier 2 is also 53
years old, and Clarifier 3 is 47 years old. Clarifiers 2 and
3 were originally designed to provide a second stage of
clarification assisted by chemical addition. Therefore,
the interior concrete surfaces and sludge collection
mechanisms for these clarifiers were exposed to a
somewhat corrosive environment. Clarifiers 2 and 3 are
also about 3 feet lower than Clarifier 1. The District now
operates Clarifiers 2 and 3 as conventional secondary
clarifiers (without chemicals) in parallel with Clarifier 1.
Because all three clarifiers operate at different elevations,
the flow must be regulated to provide an even distribution
of flow and solids loadings.
The District performed a condition assessment of the
treatment plant, including the secondary clarifiers, in
2013. Findings from the assessment are summarized in the
following table.
Since the 2013 assessment, the District has found other
deficiencies:
•The drive for Clarifier 1 is failing, and there are holes
in the sludge collector arms. The clarifier mechanisms
were manufactured by Dorr Oliver, which has long been
out of business. Replacement parts are not available and
must be custom manufactured. To maintain operational
reliability, rehabilitation of Clarifier 1 should receive
the highest priority. Replacing just the drive may not be
feasible, so it is likely that the entire sludge withdrawal
mechanism will need to be replaced.
•The clarifier drive platforms for all three clarifiers are
unusually small and the “dog house” weather enclosure
on the center is very cramped. Snow also accumulates
on the walkways to all of the clarifiers making access
difficult and hazardous in the winter.
•The activated sludge process experiences episodes of
poorly settling mixed liquor solids. Sludge volume index
(SVI) values can peak as a high as 600. A well-settling
sludge has SVIs of around 150. At high SVIs, the sludge
blanket does not consolidate well and the solids can rise
to near the height of the overflow weirs. If the sludge
blanket were to carry over the weir, the solids would
overload the downstream filters and increase the risk of
discharge permit violations. Peak flows exacerbate this
condition.
•The clarifiers do not have a peripheral baffle plate
just upstream of the overflow weirs. Hydraulic
improvements, such as internal baffles, may be needed
to improve flow patterns and settling performance.
CFD modeling is the best tool for optimizing
performance and identifying specific improvements.
A key challenge for this project is to complete
improvements for Clarifier 1 by the end of the 2020
construction season, which ends October 31. The figure
on the next page is a conceptual project schedule.
Approximately nine months are needed for submittal
review and fabrication/delivery, plus another two months
for installation of the equipment. In addition, the
foundation for the center column appears to be too small
to support a new center column designed for current
seismic codes. Replacing the mechanism will trigger the
need to comply with current structural codes. Based on
our experience, the foundation will likely need to be
replaced with a new slab designed for the required anchor
bolt embedment and to resist over-turning. Sufficient time
needs to be allocated for the seismic analysis and design of
the foundation modifications.
2. Firm’s Approach to Project
Condition Assessment Findings
Area Condition
Repairs
Recommended
Concrete Floors Hollow areas between
grout and slab
Replace grout layer
Rake Arms Exterior rust with no
surviving coating
Repair steel and coat with
epoxy
Center Column Exterior rust with no
surviving coating
Repair steel and coat with
epoxy
Weirs Coating on steel weirs
is intact
Replace with FRP weirs
Catwalk/Bridge Galvanized steel with
failing coating
None required for at least
10 years
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TECHNICAL PROPOSAL
Design Notice to Proceed (9/5/19)
Data Collection and Review
Collect and Review Data
Preliminary Site Investigations
Design
Survey Clarifier Floors and Walls
Clarifier Center Column Sesimic
Analysis
CFD Analysis
Develop and Evaluate Alternatives
Prepare Design Memorandum
(30% Design)
Prepare 90% Design
Prepare Final Contruction Documents
(2/14/20)
Bidding Services
Contract Award
Construction Notice to Proceed
Complete Rehab Clarifier 1 (10/31/20)
Pre-Purchase Documents (Optional)
Pre-Purchase Workshop
Draft Pre-Purchase Bid Package
Final Pre-Purchase Bid Package
Bid Period
Pre-Purchase Contract Award
Pre-Purchase Contract NTP
Submittals
Fabrication and Delivery – Clarifier 1
Mechanism Installation by Contractor
Meetings/Workshops
Kickoff Meeting
Design Memorandum Review
90% Design Workshop
Deliverables
(not including pre-purchase deliverables)
Design Memorandum (30% Design)
90% Design Submittal and Cost Estimate
100% Design Submittal and
Cost Estimate
Preconstruction Conference Agenda
and Notes
Addenda (as required)
Bid Analysis Memorandum
2019 2020
TASK SO SONDJ FMAMJ JA
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TECHNICAL PROPOSAL
As described in more detailed under the Approach
section, we propose a separate parallel task for
pre-purchasing and installing the Clarifier equipment.
The mechanism for Clarifier 1 would be procured on a
fast track basis. The other two clarifiers could be delivered
later for the following construction seasons. All three
clarifiers should be procured from a single manufacturer
for uniformity and all three clarifier mechanism would be
installed under a single construction contract. The key
to meeting the October 2020 deadline is to accelerate
the schedule for the seismic analysis, new center column
foundation design, preparation of the equipment
pre-purchase bid package, and manufacturer selection.
This will require a collaborative effort between the
District and Carollo.
After the first push to meet the October 2020 deadline
for Clarifier 1, it may be prudent to spread out the time
for replacing the clarifier mechanisms for Clarifiers 2
and 3. Consideration should be given to completing the
rehabilitation at the pace of one clarifier per year to allow
time for critical decisions, reduce the risk of clarifier
overloading and potential effluent discharge violations,
and develop District funding strategies.
One of the key decisions to be made is whether new
mechanisms should be installed for Clarifiers 2 and 3 or
whether they should be rehabilitated in place. Our team
will perform a life-cycle cost and risk analysis to assist the
District in making this decision. Some of the issues to be
evaluated include:
•The life span of a rehabilitated mechanism should be
compared to that of a new mechanism.
•Installing a new grout topping on the clarifier needs
to be done with the new (or existing) mechanism in
place so it can be swept in to meet clearance tolerances
between the floor and the sludge collector arms. If
the grout layer were to be replaced using the existing
mechanism, it would likely need to be replaced again
when the new mechanism is installed.
•Consideration should be given to replacing the
mechanisms with a more modern system. A
suction-type system would be more efficient in removing
the sludge blanket and preventing it from rising to
dangerously high levelsT. However, the current design of
the RAS line draw-off may preclude a suction draw-off
system.
•Converting to a suction header system may require
modifications to the RAS pumps.
APPROACH
Our overall approach will be to fast-track procurement of
the clarifier mechanism for Clarifier 1 while continuing
to design improvements for all three clarifiers. Clarifier 1
would be fully rehabilitated (including new mechanisms)
in 2020. Clarifiers 2 and 3 would be rehabilitated at
the rate of one clarifier per season over 2021/22 and
2022/23, respectively. This approach would allow time to
pre-purchase, fabricate, and deliver the sludge withdrawal
mechanisms. The benefits of pre-purchasing the clarifier
mechanisms for all three clarifiers would be uniform
equipment for all three clarifiers, the ability to design to
the details provided by the selected manufacturer, and
locked-in costs. Limiting the rehabilitation to one clarifier
per year would reduce the District’s risk of discharge
permit violations during peak loading events, such as the
July 4th weekend.
Based on our current understanding, we propose the
following scope and timeline for clarifier improvements.
Clarifi er 1 (2019/2020)
•Pre-purchased clarifier mechanism (possibly for all three
clarifiers)
•Concrete wall repairs and coatings
•New grout topping on the clarifier floor
•New sludge withdrawal mechanism spot and center
column foundation
•Performance improvements such as a peripheral baffles
and new fiberglass weirs
Clarifi ers 2 and 3 (2021-2023)
•Concrete repairs and coatings and performance
improvements
•Replacement of the sludge withdrawal mechanisms,
walkways, and platforms (if desired by the District) or,
if new mechanisms are not provided, spot repairs and
coatings on the existing mechanism
•New grout topping layer
•Improvements to the RAS pump stations, if required
•New foundation for center columns designed to match
the details of the vendor submittal (if required)
•Potentially, improvements to the groundwater relief
system
Task 1 – Data Collection and Review
This task will involve establishing baseline conditions
for the three clarifiers. As-built drawings and previous
condition assessments will be reviewed, along with
historical performance data over the past few years.
Performance data needed includes mixed liquor SVI
values, secondary effluent quality (BOD and suspended
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TECHNICAL PROPOSAL
solids), and influent loadings (flow and mixed liquor
suspended solids). Influent loadings will be correlated with
effluent quality to establish loading limitations, especially
during peak months. This will be used to develop timing
constraints for the clarifier rehabilitations. This data will
also be used to input to a CFD model to evaluate the need
for hydraulic improvements.
In addition, our team will review groundwater level
data (if available) and previous geotechnical reports.
This information will be used to assess the effects of
groundwater uplift pressures on the clarifier floor slab and
determine if groundwater dewatering would be required to
construct the new center column foundation.
Task 2 – Design
2.1 Site Investigations and Survey
Under this task, our team will perform a spot survey to
check that the tops of the clarifier walls are level and
the clarifier floors are sloping uniformly as originally
constructed. In some instances, clarifier floors can bulge
if subjected to unrelieved groundwater pressures. Spot
checks will be compared to the District’s 2016 aerial
survey of the site.
In addition, we propose to add CFD analysis to identify
any deficiencies with the flow patterns and velocities in
the clarifiers and identify possible improvements.
2.2 Condition Assessment
A detailed condition assessment will be conducted
by our subconsultant, JDH Corrosion Consultants,
Inc. The condition assessment will include visual and
non-destructive concrete testing and ultrasonic testing of
steel structures. Results from the assessment will be used
to develop the scope of the clarifier rehabilitation.
2.3 Seismic Analysis and Groundwater Uplift Analysis
A structural analysis will be performed to determine the
need for a new center column foundation if a new clarifier
mechanism is installed. In addition, the clarifier walls will
be evaluated for compliance with current seismic codes.
An analysis of groundwater uplift forces and potential
pressure relief system improvements will be conducted.
2.4 – Alternatives Development and Evaluation
Our team will work with the District to identify the
project’s objectives and focus the alternatives analysis on
solving the most important issues. Potential alternatives to
be evaluated include:
•Scope for rehabilitating the sludge withdrawal
mechanisms – i.e., spot repairs and coatings versus all
new mechanisms
•Pre-purchasing of clarifier mechanisms
•Cost estimates and cash flow analysis
•Hydraulic improvements based on CFD analysis
•Concrete repair/coating methods
•Potential modifications to the groundwater relief system
or recommended procedures when a clarifier needs to
be emptied
2.5 – Alternatives Evaluation Workshop
Our team will conduct a workshop with the District to
review the alternatives analysis and recommendations.
The desired outcome of the workshop will be the scope
of the rehabilitations, project phasing/schedule, and
cost estimate. Results from this workshop will be the
framework for pre-purchasing the clarifier mechanism for
Clarifier 1 and potentially for the other two clarifiers (see
Task 2.6).
2.6 – Design Memorandum
The Design Memorandum will summarize the results of
the alternatives workshop and baseline conditions. The
memorandum will be the basis for design and will be
developed to approximately the 30 percent design stage.
2.7 – Basis of Design Workshop
A workshop will be conducted with the District to review
the Design Memorandum and confirm the basis for
completing the 90 percent design.
2.8 – 90 Percent Design Documents
The 90 percent design will be submitted to the District for
review. A workshop will be held to review the design and
incorporate comments for the final 100 percent design.
The 90 percent cost estimate will also be presented.
Details of the pre-purchased clarifier mechanism submittal
will be incorporated in the design.
Task 3 – Construction Documents (100 Percent
Design)
Final documents suitable for bidding will be prepared,
including drawings, specifications, and final engineer’s
estimate. It is assumed that the construction documents
will encompass rehabilitation of all three clarifiers and the
clarifier mechanisms will be pre-purchased by the District
and assigned to the successful bidder for installation.
Task 4 – Bidding Services
This task will include attending the pre-bid conference
and providing clarifications to questions from bidders by
preparing addenda. In addition, our team will provide a
bid analysis summary to provide the basis for the District
to determine responsiveness of the bidders.
9
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TECHNICAL PROPOSAL
Task 5 – Project Management
Project management services will include resource
management and preparation of monthly reports.
OPTIONAL SERVICES
The following tasks will be completed if authorized by the
District.
Task 6 – Pre-Purchase Documents
6.1 Scoping Workshop. Given the time constraints for
Clarifier 1, it will be necessary to pre-purchase the clarifier
mechanism to gain time over the conventional contractor-
procured method. We propose to hold a workshop to
discuss the procurement approach. Minutes from the
workshop will be the basis for developing the pre-purchase
documents. The objectives of the workshop include:
•Confirm the scope of repairs for Clarifier 1, including
needs for seismic upgrades and concrete coatings
•Identify a short list of at least three manufacturers to be
named in the pre-purchase documents
•Identify needs and materials for the new catwalk, center
platform, and center column
•Identify needs for the new center column foundation
•Decide whether new mechanisms for Clarifiers 2 and 3
will be included in the pre-purchase contract
•Establish a budget estimate and schedule for the
pre-purchase contract
•Determine terms of the pre-purchase contract: full pre-
purchase of the equipment including full payment by
the District, or payment only for submittal preparation
and assignment of the clarifier contract to the
installation contractor
•Identify District front-end specifications/conditions for
a pre-purchase contract
6.2 Pre-Purchase Package. Carollo will prepare
pre-purchase package specifications and guide drawings
suitable for bidding by vendors. The pre-purchase package
will be prepared in draft and finalized with the District’s
comments.
6.3 Bidding Services for Pre-Purchase Contract. Our
team will answer questions during the bid period and
prepare addenda as required. We will also evaluate the
vendor bids for responsiveness. It is assumed that the
District will conduct a pre-bid conference is required.
6.4 Review Vendor Submittals. This step is critical for
maintaining the fast-track schedule. Our team will provide
technical review of the clarifier submittals in parallel
with the District’s team from engineering, operations,
and maintenance. The vendor can begin fabrication
once approval of the submittals is issued by the District.
The District may need to fund some portion of the
pre-purchase contract to allow for the vendor’s effort to
develop the submittals and expedite approvals.
Task 7 – CFD Modeling
Two-dimensional dynamic CFD modeling will be
performed for the current clarifier configurations to
identify flow velocities and improvements to enhance
settling. Results from the analysis will be summarized in a
brief technical memorandum.
DELIVERABLES
The following deliverables are proposed:
•Design Memorandum, draft and final versions
•Clarifier pre-purchase workshop meeting notes
•Clarifier pre-purchase package specifications
•Review comments for the clarifier submittal
•90 percent design submittal for the overall installation
contract, including plans, specifications, construction
constraints, and cost estimate
•Final contract documents suitable for bidding and a
final engineer’s estimate
•Meeting agendas and notes
•Addenda (three assumed)
10
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TECHNICAL PROPOSAL
Carollo’s team brings a proven track record of developing
successful solutions to complex wastewater treatment
challenges. We have a strong history with clients
throughout California and will use this experience to
help the District make sound decisions and deliver an
innovative design that optimizes your future investment.
Our key team members’ local presence and connectivity to
the South Lake Tahoe area foster successful collaboration
from design through construction.
SENIOR LEADERSHIP YOU CAN TRUST
Superior leadership provides credibility for all of your
technical decisions and ultimately translates into better
outcomes for the District. Our project team brings
knowledge gained from years of experience. In addition,
our team has proven experience with a wide range of
secondary clarifier design projects at other locations to
give you confidence that we will provide state-of-the-art
rehabilitation of your secondary clarifiers.
Mike Britten, PE | Project Manager
Tel: 775-324-4427 | Email: mbritten@carollo.com
Mike has 45 years of experience in planning
and design of wastewater treatment plants,
with an emphasis on expansion and upgrade of existing
facilities. He recently completed his role as program
manager for the $40 million San Jose Nitrification
Clarifier Project, which involved rehabilitation of 16
140-foot-diameter clarifiers. Many of the issues facing the
District were addressed in the design, including concrete
repairs, new grout toppings, groundwater relief valves, and
new sludge withdrawal mechanisms. Mike was also project
manager for secondary clarifiers at the City of Turlock,
Sewer Authority Mid-Coastside (Half Moon Bay), City
of South San Francisco, and Veolia Water/Richmond
Wastewater Treatment Plant.
As project manager, Mike will be responsible for overall
implementation of the technical aspects of your project.
He will also be responsible for meeting the budget and
schedule, control of project activities, commitment of
resources, and technical accuracy of the work. He will also
serve as principal liaison between Carollo and the District
throughout the project.
Scott Parker, PE, BCEE | Principal-in-Charge/
Technical Advisor
Tel: 916-576-4720 | Email: sparker@carollo.com
Scott has more than 29 years of experience
with a wide array of planning, design, and construction
projects for wastewater treatment and conveyance.
He is well known to the District, having served as
principal-in-charge for the Big 5 Pump Station Condition
Assessment, Twin Peaks Pump Station and Water Line
Replacement, and Headworks Replacement. Scott will
have ultimate responsibility for your project. He will
participate in all contract matters and monitor procedures
for quality control and project progress. Scott will support
Mike to maintain the budget, schedule, and commitment
of resources.
3. Project Team
Key Team Member
Availability
Percent
Available for
This Project
Commitment
to Other
Projects
Mike Britten, Project Manager 25% 75%
Scott Parker, Principal-in-Charge
and Technical Advisor
10% 70%
Ricky Gutierrez, Project Engineer 35% 65%
Ed Wicklein, CFD Modeling 25% 75%
Mike Dadik, Structural/Coatings 20% 80%
Daniel Robinson, EI&C 20% 80%
Eric McGrath, Pre-Purchase
Package
20% 80%
PROJECT MANAGER
Mike Britten, PE*
* Reno Based
1 CTA Engineering & Surveying
2 JDH Corrosion Consultants, Inc.
PROJECT ENGINEER
Ricky Gutierrez, PE*
Stephen Caswell, PE
PROJECT MANAGER
CFD MODELING
Ed Wicklein, PE
PRINCIPAL-IN-CHARGE
Scott Parker, PE, BCEE
STRUCTURAL/COATINGS
Mike Dadik, PE, SE
ELECTRICAL/I&C
Daniel Robinson, PE
PRE-PURCHASE PACKAGE
Eric McGrath, PE*
SURVEYING
Kevin Heeney, PLS 2
CONDITION ASSESSMENT
Darby Howard, PE 2
11
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TECHNICAL PROPOSAL
Ricky Gutierrez, PE | Project Engineer
Tel: 530-312-1330 | Email: rgutierrez@carollo.com
Ricky has 15 years of experience in a broad
range of projects involving planning, design,
and construction of wastewater treatment facilities, water
treatment facilities, pipelines, and pump stations. As
project engineer, Ricky will be responsible for discipline
coordination and day-to-day engineering of your project to
produce the plans, specifications, and cost estimates.
STRONG DISCIPLINE SUPPORT
Discipline support will be provided by experienced
professionals who have completed projects of similar size
and complexity.
Ed Wicklein, PE | CFD Modeling
Ed has 21 years of experience focused on
design and analysis of municipal hydraulic and
treatment facilities using CFD modeling. He
has experience in all phases of modeling, including code
development, flow analysis, and data visualization. Ed
has completed more than 100 CFD projects, which have
included CFD analysis of flow splitting structures and
secondary sedimentation processes.
Mike Dadik, PE, SE | Structural and Coatings
Mike is Carollo’s structural practice leader
for Northern California. With more than 28
years of experience, Mike specializes in water
and wastewater treatment and infrastructure design,
seismic rehabilitation and retrofit, and coating and
corrosion control. Mike has performed structural design
of more than $300 million in wastewater expansion and
rehabilitation projects.
Daniel Robinson, PE | Electrical/Instrumentation
& Controls (EI&C)
Daniel has 20 years of EI&C systems
experience, including SCADA and control
systems analysis and design; variable frequency drive,
reduced voltage soft starter, and full-voltage motor control
design; programmable logic controller/control panel design;
control systems architecture; serial, Ethernet, and radio
communication; process instrumentation requirements;
and UL, NEC, NEMA, and NFPA 70E requirements.
Eric McGrath, PE | Pre-Purchase Package
Eric is a civil engineer with more than 32
years of experience, including management
of construction plan and specification
development for a variety of water and wastewater civil
engineering projects.
Kevin Heeney, PLS | Surveying
Kevin is a Principal Surveyor with CTA
Engineering and Surveying. For 43 years, he
has been involved with surveying and mapping
projects throughout California, drawing on his knowledge
of technologies and his project management skills to
ensure the successful completion of projects.
Darby Howard, PE | Condition Assessment
Darby has 35 years of experience specializing
in corrosion failure analysis, material selection
for corrosive environments, cathodic protection
design and engineering maintenance, and stray current
analysis for water and wastewater pump stations, treatment
plants, and pipelines. Darby worked with Carollo on
STPUD’s Big 5 Pump Station Condition Assessment.
Team Member Qualifi cations and Experience
Team Member Relevant Project Experience
Mike Britten, PE
Project Manager
Reno Offi ce
BS Civil Engineering
45 Years of Experience
• Program manager for the City of San Jose, CA, Nitrifi cation Clarifi er Rehabilitation project.
• Project manager for design of the City of Turlock, CA, Secondary Clarifi er No. 4.
• Project manager for design of the City of San Francisco, CA, Clarifi ers 3 and 4.
• Project manager for the Sewer Authority Mid-Coastside, CA, Wastewater Treatment Plant Expansion, which included
two new circular secondary clarifi ers.
• Project manager for the Veolia Water, CA, Richmond Wastewater Treatment Plant Secondary Clarifi er Improvements.
Scott Parker, PE,
BCEE
Principal-in-Charge/
Technical Advisor
Sacramento Offi ce
MS Environmental, BS Civil
Engineering
29 Years of Experience
• Principal-in-charge/project manager for the South Tahoe Public Utility District, CA, Headworks Replacement and
Twin Peaks Booster Station and Water Line Replacement.
• Principal-in-charge/project manager for the Fairfi eld-Suisun Sewer District, CA, $22 million Secondary Treatment
Expansion, which included conversion of an intermediate clarifi er and new secondary clarifi ers.
• Principal-in-charge for the City of Chico, CA, $45 million Water Pollution Control Plant Expansion to 12 mgd. New
facilities include headworks, aeration tanks, aeration blowers, secondary clarifi er, etc.
• Project manager/engineer for the City of Chico, CA, $33 million 9-mgd nitrifi cation improvements, which involved
headworks, primary clarifi ers, anaerobic digesters, secondary clarifi ers, and aeration blowers.
12
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TECHNICAL PROPOSAL
Team Member Qualifi cations and Experience
Team Member Relevant Project Experience
Ricky Gutierrez, PE
Project Engineer
Reno Offi ce
MS Civil and Environmental,
BS Civil Engineering
15 Years of Experience
• Project engineer for the South Tahoe Public Utility District, CA, Process and Hydraulic Analysis, which involved an
evaluation of the Wastewater Treatment Plant that focused on the activated sludge unit process.
• Design engineer and resident engineer during construction of the City of Chico, CA, Water Pollution Control Plant
12-mgd Expansion, which included a new headworks facility, aeration tanks, secondary clarifi er, digester, etc.
• Project manager for the Fairfi eld-Suisun Sewer District, CA, Blower Replacement, which enhanced the reliability and
effi ciency of the secondary treatment process aeration system.
• Project engineer for the Sacramento Regional County Sanitation District, CA, EchoWater Project $32 million Return
Activated Sludge Pumping Project, which includes 48 pumps located at 24 secondary sedimentation tanks.
Ed Wicklein, PE
CFD Modeling
Seattle Offi ce
MS/BS Civil Engineering,
Hydraulics
21 Years of Experience
• Project engineer for the South Tahoe Public Utility District, CA, Headworks Replacement. Used CFD modeling to
optimize fl ow split and velocity distribution in the channels leading to primary clarifi ers.
• Project engineer for the West County Sewer District, CA, Secondary Clarifi er Improvements. Used a custom solids
transpor t model to evaluate inlet baffl e improvements to increase the sedimentation capacity.
• Project engineer for CFD modeling for the Vallejo Sanitation and Flood Control District, CA, Secondary Clarifi ers. Used
the CFD model to evaluate performance for a range of commercially available products.
Mike Dadik, PE, SE
Structural and
Coatings
Walnut Creek Offi ce
BS Civil Engineering
28 Years of Experience
• Structural engineer for the South Tahoe Public Utility District, CA, Sludge Handling/Odor Control Facilities and
Headworks Replacement projects.
• Structural engineer for preliminary and fi nal design of the City of Turlock, CA, Headworks and Secondary Treatment
Capacity Expansion Phase 1.
• Structural engineer for the Union Sanitary District, CA, Primary Clarifi er Rehabilitationpreliminary/fi nal design.
• Structural engineer for the Fairfi eld-Suisun Sewer District, CA, $22 million Secondary Treatment Expansion, which
included intermediate clarifi er, secondary clarifi ers, infl uent pump station, and aeration basin retrofi ts.
Daniel Robinson, PE
Electrical/I&C
Sacramento Offi ce
BS Mechanical Engineering
Technology
20 Years of Experience
• Electrical/instrumentation and controls manager for the City of Hughson, CA, Wastewater Treatment Plant
Expansion, which included main lift station, headworks, oxidation ditch, and secondary clarifi er.
• Electrical/instrumentation and controls manager for the City of Reno, NV, Water Reclamation Facility Expansion,
which included headworks, oxidation ditch, aeration basin, secondary clarifi er, chlorine contact basin, etc.
• Instrumentation and controls engineer for the Sacramento Regional County Sanitation District, CA, EchoWater
Project $32 million Return Activated Sludge Pumping Project.
Eric McGrath, PE
Project Engineer
Reno Offi ce (775-332-8732)
BS Civil Engineering
32 Years of Experience
• Project manager for the Washoe County, NV, Collection System Flow Monitoring and Hydraulic Modeling.
• Project manager for the County of Washoe, NV, Pleasant Valley Interceptor 3 Predesign.
• Project manager for the City of Millbrae, CA, Madrone Pump Station Rehabilitation and Preliminary Design.
• Project engineer for the Contra Costa Water District, CA, Treated Water Renewal and Replacement Study Update Asset
Management Plan.
Kevin Heeney, PLS
Surveying
Engineering, Industry, and
Technology
43 Years of Experience
• Sacramento Regional County Sanitation District, CA, EchoWater Projects.
• California Department of Corrections and Rehabilitation Deuel Vocational Institution Wastewater Treatment Plant
Modifi cations mapping and Due Diligence documents.
• City of Sacramento, CA, Sacramento River/E.A. Fairbairn Water Treatment Plants Rehabilitation topographic mapping.
• California Department of Corrections and Rehabilitation California Men’s Colony Wastewater Treatment Plant UV
Disinfection Design.
J. Darby Howard, PE
Condition Assessment
BS Civil/Structural
Engineering
35 Years of Experience
• Corrosion assessment specialist for the South Tahoe Public Utility District, CA, Big 5 Pump Station Condition
Assessment, which involved on-site corrosion evaluation of wet wells to assess extent of deterioration.
• Delta Diablo, CA, Headworks Concrete Condition Assessment, which involved an inspection of the wastewater
treatment plant screen channel, manhole infl uent pipe, and grit chamber pump room.
• Sacramento Regional County Sanitation District, CA, Arden Pump Station wet well condition assessment, including
infl uent channels, sluice gates, hand rails, concrete walls, manholes, and various appurtenances.
• City of San Mateo, CA, Wastewater Treatment Plant, which included a condition assessment of reinforced concrete
exposed to wastewater in the infl uent junction box and recommendations for remedial repair based on fi ndings.
B:\Pursuits\Client84(SAC)\STPUD\SecClarifierRehab\Prop0719\Indd\02-ManhourEst.indd14TECHNICAL PROPOSAL4. Manhour EstimateESTIMATED LEVEL OF EFFORTTaskS. Parker M. Britten R. Gutierrez E. McGrath C. Taylor M. Dadik D. Robinson E. WickleinPrincipal-in-ChargeQA/QCProjectManagerProjectEngineerProjectEngineerPre-PurchaseStaff ProfessionalStructuralEngineerEI&CEngineerCFDModeling SeniorCADTechnicianGraphics/ CADTechnicianClericalSupportTotal TASK 1 – DATA COLLECTION AND REVIEW 1.1 Kickoff Meeting 66804000004281.2 Review Operating Data, Reports, and Existing Conditions 1480840000025Task 1 Hours 7101601240000453TASK 2 – DESIGN2.1 Site Investigations and Survey 1110016000044362.2 Conduct Condition Assessment 04808000000202.3 Conduct Seismic Analysis and Groundwater Uplift Analysis 248002400400422.4 Alternatives Development and Evaluation 2416424640008682.5 Alternatives Evaluation Workshop 41212012000000402.6 Prepare Design Memorandum 2416016440048582.7 Basis of Design Workshop 066012000000242.8 Prepare 90% Design and Cost Estimate12264201232964053132295092.9 90% Design Workshop06601200000024Task 2 Hours 23671244223637205714049821TASK 3 – CONSTRUCTION DOCUMENTS3.1 Prepare 100% Design Documents and Cost Estimate6111805312270265314220Task 3 Hours 6111805312270265314220TASK 4 – BIDDING SERVICES4.1Attend Pre-Bid Conference02408000000144.2 Prepare Addenda121601622040414Task 4 Hours 142002422040428TASK 5 – PROJECT MANAGEMENT5.1 Resource Management and Monthly Reporting21680000000026Task 5 Hours21680000000026TASKS 1-5 TOTAL HOURS 39108186431281101087192711,148OPTIONAL SERVICESTASK 6 – PREPARE PRE-PURCHASE DOCUMENTS Task 6 Hours 21220404044081216158TASK 7 – CFD MODELINGTask 7 Hours241600004600068OPTIONAL SERVICES TOTAL HOURS 416364040444681216226
B:\Pursuits\Client84(SAC)\STPUD\SecClarifierRehab\Prop0719\Indd\03-InfoDocNeeds.indd
15TECHNICAL PROPOSAL
The only information we anticipate needing from the
District is data on historical groundwater levels, which will
be used to assess the effects of groundwater uplift pressures
on the clarifier floor slab and determine if groundwater
dewatering would be required to construct the new center
column foundation.
5. Information/Document Needs
pw:\\Carollo/Documents\Client/CA/Veolia/10340A10/Deliverables/PM01\PM_FeasiibilityOfIncreasingSecondaryClarifierCapacity
PROJECT MEMORANDUM
CITY OF RICHMOND WWTP
CRITICAL IMPROVEMENTS
PROJECT
City of Richmond
Prepared By: E. Wicklein
Reviewed By: J. McCormick, A. Conklin, K. Rogers, D. Jenkins
Subject: Feasibility of Increasing Secondary Clarifier Capacity
Objective
The objective of this project memorandum is to summarize the feasibility of implementing a new clarifier
mechanism in each of the existing secondary clarifiers and to assess impact on capacity.
Conclusion
Computational fluid dynamics (CFD) modeling was performed to assess the impact of the new mechanism
on the plant capacity. Replacing the existing clarifier mechanisms with new mechanisms is not anticipated
to increase the treatment capacity of the clarifiers.
Recommendations
It is recommended the City:
• Replace the existing clarifier mechanisms with new clarifier mechanisms in order to replace aging
infrastructure that has reached the end of its useful life and is essential to providing wastewater
treatment. The mechanisms also need to be replaced because their current condition poses a safety
hazard. These improvements should be implemented in the immediate term, as part of the WWTP
Critical Improvements Project.
• Should increased clarifier capacity be required in the future, it is recommended the City increase the
firm return activated sludge (RAS) pumping capacity from 6.0 mgd to 13.0 mgd.
• Should nutrient removal (e.g., nitrification and denitrification) be required in the future, it is
recommended the City implement additional aeration basins and/or secondary clarifiers.
Summary
As identified in the 2010 WWTP Master Plan and 2016 WWTP Facility Plan, upgrades to the secondary
clarifiers are required to improve the performance of the secondary treatment process to more reliably
removal total suspended solids (TSS). The secondary clarifiers have some performance related issues and
the secondary clarifier mechanisms have reached the end of their useful life. Secondary clarifier
improvements were designed as part of the WWTP Critical Improvements Project to replace the aging
mechanisms and address performance issues where feasible. As part of the design effort, an evaluation was
completed to determine if additional modifications could be made to increase the treatment capacity of the
clarifiers. The evaluation included three dimensional computational fluid dynamics (CFD) modeling.
Date: 10/10/2017
Project No.: 10340A.10
Based on the evaluation, the overall structural shape of the clarifiers is the most significant factor limiting
their capacity. Secondary Clarifiers No. 1 and 2 (SC-1 and SC-2) are square in shape, have a relatively shallow
depth, and flat floor. Secondary Clarifier No. 3 (SC-3) - although round - is also relatively shallow and has a
moderately sloped floor. As a result, although modifications can be made to the existing clarifiers to
optimize their performance and increase their reliability, these modifications are not anticipated to increase
their solids loading capacity or significantly improve their performance. The modifications will largely
replace aging infrastructure that is essential to treatment operations. Replacing the mechanisms will also
improve plant safety because their current condition poses a safety hazard.
To maximize the use of existing assets and minimize costs, it is recommended the City implement the
following improvements to replace aging infrastructure and optimize the performance of the secondary
clarifiers (where feasible) to more reliably remove TSS:
1. Maintain even flow split between the clarifiers by setting the existing gates at predetermined
positions.
2. Install a coarse air mixing system in the mixed liquor channel to ensure solids are well mixed and
evenly split between the clarifiers.
3. Improve inlet conditions in the modified clarifier
a. Replace the elevated inlet channel with a mid-depth suspended influent pipe that turns upward
at the center of the tank and enters a conventional energy dissipating inlet (EDI) feed well.
b. Add Stamford baffles to SC-3.
4. Replace the existing suction header type mechanism with a new suction header type mechanism.
5. Simplify and improve the suction header design:
a. Fill in the deep center well with concrete so the floor is more level throughout the clarifier.
b. Fill in the corners of the "squircles" with concrete to guide the sludge toward the circular
removal header.
With the implementation of these improvements, the secondary treatment capacity is estimated to be
20 million gallons per day (mgd) at a mixed liquor suspended solids (MLSS) concentration of no more than
1,800 milligrams per liter (mg/L) and a sludge volume index (SVI) of 150 mL/g. This equates to an average
and peak solids loading rate (SLR) of 4and 13 ppd/sf in the year 2027, respectively. This is sufficient
treatment capacity to treat the projected near-term flows and loads for biochemical oxygen demand (BOD)
and TSS removal without nitrification, and may be sufficient to treat projected flows and loads through 2027
assuming no changes in permit conditions. However, depending on the actual operating conditions of the
secondary treatment process, influent flow and loads, and clarifier performance, additional improvements
may be required to increase the secondary clarifier capacity prior to 2027.
To increase the capacity of the secondary clarifiers, the firm RAS pumping capacity could be increased from
6.5 mgd to 13 mgd. With this improvement, the secondary treatment capacity is estimated to be 20 mgd at
an MLSS concentration of no more than 2,200 mg/L and an SVI of 150 mL/g. This is anticipated to provide
sufficient capacity to treat buildout flows and loads for BOD and TSS removal assuming no changes in
permit conditions. However, during maximum month flows and loads, additional aeration basin volume may
be required. It is anticipated the standby aeration capacity provided by Zones B and C of Aeration Basin No.
2 could be used during the maximum month conditions. (Note, this standby aeration capacity is to be
implemented with the WWTP Critical Improvements Project.)
It is anticipated additional aeration basins and/or secondary clarifiers would be required to provide nutrient
removal (e.g., nitrification and denitrification). After the secondary clarifier improvements included in the
WWTP Critical Improvements Project are implemented, it is recommended the City assess the actual
performance of the secondary clarifiers. The Facility Plan and associated capital improvement program (CIP)
could then be updated based on the secondary clarifier performance and any updates to the anticipated
nutrient removal regulations.
This memorandum summarizes the secondary clarifier performance issues, the CFD modeling approach, the
CFD modeling results, and the recommended improvements.
Secondary Clarifier Performances Issues
As identified in the 2010 WWTP Master Plan and 2016 WWTP Facility Plan, the secondary clarifiers have the
following performance issues:
• In the square clarifiers (SC-1 and SC-2), sludge accumulates in the corners and turns septic. As a
result, the sludge rises to the surface and goes over the effluent weirs, which contributes to poor
performance and increases the potential for TSS violations. The Master Plan recommended filling in
the corners of the clarifiers with concrete to make them more circular. This will allow the sludge to
settle towards the center of the clarifiers, instead of accumulating in the corners.
• The draft tubes in all three clarifiers clog frequently, causing the sludge blankets to rise in portions
of the clarifiers that are serviced by the clogged draft tubes. The draft tubes clog because a large
amount of debris passes through the coarse bar screen. The Master Plan recommended replacing
the clarifier mechanism with a blade type collector that moves the sludge to the center of the
clarifier for removal.
• When operated at high flows, Clarifier No. 3 has solids carryover into the effluent. Possible reasons
for this include clogged draft tubes and short-circuiting due to high weir overflow rates. The Master
Plan recommended installing density current baffles to the clarifier and replacing the feed well with
an energy dissipater/flocculating feed well.
CFD Modeling Approach
CFD modeling of the secondary clarifier performance was conducted to determine recommended
improvements to address these issues. More specifically, it was conducted to determine the optimal
mechanism design and to identify other modifications to the secondary clarifiers that could cost effectively
improve performance and maximize capacity.
Flows and Loads
Table 1 summarizes the current and projected secondary influent flows and loads and operating conditions
used for this analysis. The flows and loads were taken from the 2016 Facility Plan. The operating conditions
are based on the design criteria for the WWTP Critical Improvements Project.
Table 1 Current and Projected Future Operating Conditions
Design Criteria Current (2015) Projected 2027 Projected 2040
Treatment Type BOD/TSS removal BOD/TSS removal BOD/TSS removal
Average Dry Weather
Secondary Effluent Flow, mgd (1) 5.8 6.5 7.4
RAS, mgd 3.7 4.2 4.7
Total Flow to Secondary Clarifiers, mgd 9.5 10.7 12.1
MLSS, mg/L 1,000 1,800 2,000
SVI, mL/g 150 150 150
Max Month
Secondary Effluent Flow, mgd (1) 13.5 15.2 (3) 17.3 (3)(5)
RAS, mgd 6.5 6.5 (3) 6.5 (3)
Total Flow to Secondary Clarifiers, mgd 20 21.7 23.8
MLSS, mg/L 1,700 1,800 2,200
SVI, mL/g 150 150 150
Peak Wet Weather
Secondary Effluent Flow, mgd 20 20 (3) 20 (4)
RAS, mgd 6.5 6.5 (3) 13.0 (4)
Notes:
(1) Per 2016 WWTP Facility Plan.
(2) RAS Pumping Capacity = 6.5 mgd (Firm); 13 mgd (Total).
(3) Improvements to increase firm RAS pumping capacity from 6.5 mgd to 13.0 mgd may be required.
(4) Improvements to increase firm RAS pumping capacity from 6.5 mgd to 13.0 mgd would be required.
(5) Secondary treatment capacity may be limited by the solids loading rate (SLR) on the secondary clarifiers. Additional aeration basin
volume may be required to treat maximum month flows and thereby reduce the MLSS concentration to reduce the SLR on the secondary
clarifiers.
CFD Model Configuration
A model was developed of one of the "squircle" clarifiers (SC-1, SC-2) to evaluate the secondary clarifier
performance. The SCs 1 and 2 have a slightly less optimum configuration than SC-3 and are therefore
assumed to conservatively estimate the performance of SC-3. Furthermore, the recommended
improvements to SCs 1 and 2 will make them more similar to SC-3.
SCs 1 and 2 are "squircle" type clarifiers i.e. square with rounded corners. They have an elevated influent
channel, inward flowing feed well, and an inboard launder. The bottom is nearly flat in most of the clarifier,
with a deeper recessed section in the middle. SC-3 is a circular clarifier, with an elevated influent channel,
inward flowing feed well, and an overflow weir located on the outside wall of the clarifier. The bottom is
sloped in most of the clarifier, with a deeper recessed section in the middle.
The model computational mesh size varied from 0.24 inches to approximately 4-inches with approximately
1.4 to 1.7 million computational elements. The model used a custom solids transport model based on sludge
volume index (SVI) to evaluate sedimentation. Details such as an energy dissipating inlet (EDI) were not
evaluated at this time, however it is assumed that an EDI would be included from the equipment supplier
that promoted uniform inflow conditions. It is assumed that once the secondary clarifier improvements are
implemented, the three secondary clarifiers will have similar treatment performance and capacity. As a
result, the simulations assumed the total system flow was divided evenly between the three clarifiers.
CFD Modeling Results
Mechanism Type and Concrete Fillets
The overall structural shape of the clarifiers is the most significant factor limiting their capacity. They are
relatively shallow and flat compared to modern secondary clarifiers. As a result, although modifications can
be made to the existing clarifiers to optimize their performance and increase their reliability, the CFD
modeling results indicate these modifications are not anticipated to increase the capacity of the secondary
clarifiers or significantly improve their performance.
The model was initially setup with a scraper mechanism moving sludge to the center deeper drawoff well,
and outward flowing feedwell. The performance was simulated at the maximum projected flow and load
condition - 2040 maximum month flow of 17.3 mgd, a firm RAS capacity of 6.5 mgd, MLSS inflow of 3500
mg/l, and SVI of 150 mL/g. The model results (which are shown in Figure 1 of Appendix A), show the clarifiers
appears overloaded and at or near failure.
Based on the CFD modeling results, industry experience, and manufacturer recommendations it was
determined a suction type mechanism would be the most appropriate technology for this application. In flat
bottom clarifiers, suction-type mechanisms typically result in lower sludge blankets as compared to scraper-
type mechanisms and generally perform better 1. Although draft tubes on suction headers can clog, the
benefit of increased sludge removal outweighs this drawback. The modern suction header technology
recommend is expected to be less prone to clogging than the existing suction header because the modern
header has larger diameter draft tubes. However, it should be noted, the most effective way to reduce
clogging issues would be to implement a new screening and grit removal facility at the WWTP.
Several modifications to optimize basin performance were identified and modeled. These improvements
include:
• To achieve more even sludge withdrawal, implement a suction header.
• To simplify the suction header design:
- Fill in the deep center well with concrete so the floor is more level throughout the clarifier.
- Fill in the corners of the "squircles" with concrete to guide the sludge toward the circular
removal header
• To improve the distribution of the influent flow within the clarifiers:
- Replace the elevated inlet channel with a mid-depth suspended influent pipe that turns upward
at the center of the tank and enters a conventional EDI feed well.
- In Clarifier 3, add an EDI feed well to dissipate the energy of the influent flow and Stamford
baffle to help control return density current. (Note, this baffle was not modeled but based on
previous installations is anticipated to improve sedimentation.)
The model was re-run to determine the maximum MLSS concentration that could be sustained at peak flow
with the recommended improvements. Peak flow to the clarifiers was determined to be 26.5 mgd, which is
comprised of the estimated peak day secondary process flow of 20 mgd and the firm RAS pumping capacity
of 6.5 mgd. At this flow condition and an SVI of 150 ml/g, the estimated maximum MLSS is 1,800 mg/L.
Figure 2 in Appendix A shows the clarifier performance at these conditions.
1 Per Ekama, G.A., Barnard, J., Gunthert, F., Krebs, P., McCorquodale, J.A., Parker, D.S., and Wahlberg, E.J. (1997).
Secondary Settling Tanks: Theory, Modelling, Design and Operation. Published by the International Association on
Water Quality, STR No. 6, 1997, Richmond, UK.
This is sufficient treatment capacity to treat the projected near-term (2018 – 2023±) flows and loads for BOD
and TSS removal, and may be sufficient to treat projected flows and loads through 2027. However,
depending on the actual operating conditions of the secondary treatment process (e.g., SVI and SRT),
influent flow and loads, and clarifier performance, additional improvements may be required to increase the
secondary clarifier capacity prior to 2027.
If the secondary clarifier capacity begins to be exceeded the City could implement the following operational
changes to increase capacity:
• Reduce the SVI. It is important to note, all analysis was based on an SVI of 150 mL/g. All options to
reduce SVI to this level or lower should be explored first and foremost, as SVI will have a significant
impact on the capacity. Options to reduce SVI include:
- Add chlorine to the RAS line
- Add polymer to the mixed liquor channel or aeration basins
- Increase the anaerobic volume of the aeration basins
• Use the standby aeration capacity provided by Zones B and C of Aeration Basin No. 2 for treatment.
(Note, this standby aeration capacity is to be implemented with the WWTP Critical Improvements
Project.)
RAS Pumping Improvements
To increase the capacity of the secondary clarifiers, the firm RAS pumping capacity could be increased from
6.5 mgd to 13 mgd. With this improvement, the secondary treatment capacity is estimated to be 20 mgd at
an MLSS concentration of no more than 2,200 mg/L and an SVI of 150 mL/g. This is capacity is limited by the
SLR on the secondary clarifiers. (Note, the total flow to the clarifiers would be 33 mgd = 20 mgd secondary
process flow + 13 mgd RAS flow.) Figure 3 in Appendix A shows the clarifier performance at these conditions.
This is planned to provide sufficient capacity to treat buildout flows and loads for BOD and TSS removal in
dry weather. However, during maximum month flows and loads, additional aeration basin volume may be
required to reduce the MLSS concentration and resulting SLR on the secondary clarifiers. It is anticipated the
standby aeration capacity provided by Zones B and C of Aeration Basin No. 2 could be used during the
maximum month conditions. (Note, this standby aeration capacity is to be implemented with the WWTP
Critical Improvements Project.)
Nutrient Removal Improvements
The 2016 Facility Plan assumed the secondary treatment facilities could be optimized and expanded to
provide nutrient removal (e.g. nitrification and denitrification) in the future to meet anticipated discharge
regulations. It was assumed additional aeration basins would be required, but that the existing secondary
clarifiers would have sufficient capacity.
Operating at an aerobic SRT (aSRT) of around 7 days will likely be required in the future to provide nutrient
removal. Based on process modeling results, operating at these elevated aSRTs will likely increase the MLSS
concentration to around 3000 to 3500 mg/L. Based on the findings of the WWTP Critical Improvements
design and this CFD modeling effort, it is anticipated both additional aeration basins and secondary clarifiers
will be required to allow for operation at these higher aSRTs to provide nutrient removal. Figure 7 in
Appendix A shows the secondary clarifier approaches failure when the MLSS concentration is increased to
3,500 mg/L.
After the secondary clarifier improvements included in the WWTP Critical Improvements Project are
implemented, it is recommended the City assess the actual performance of the secondary clarifiers. The
Facility Plan and associated capital improvement program (CIP) could then be updated based on the
secondary clarifier performance and any updates to the anticipated nutrient removal regulations. This effort
should then be repeated once the aeration upgrades included in the WWTP Critical Improvements Project
are implemented.
Prepared by:
Ed Wicklein
EW:dlt
Appendix A
CFD Modeling Results
A-1
pw:\\Carollo/Documents\Client/CA/Veolia/10340A10/Deliverables/PM01\PM_FeasiibilityOfIncreasingSecondaryClarifierCapacity
Figure 1. Secondary Clarifier 1 (or 2) with a Scraper-Type Mechanism, at 2040 Maximum Month Flow Conditions
and MLSS = 3,500 mg/L
Figure 1 shows the clarifier is at or near failure. Based on this, it was determined a scraper type mechanism
would not provide sufficient sludge removal.
A-2
pw:\\Carollo/Documents\Client/CA/Veolia/10340A10/Deliverables/PM01\PM_FeasiibilityOfIncreasingSecondaryClarifierCapacity
Figure 2. Secondary Clarifier 1 (or 2) with a Suction-Type Mechanism and Concrete Fillets, at 2027 Peak Flow and
Maximum Month Flow Conditions
Figure 2 shows the clarifier performance is much better with a suction-type header and concrete fillets in the
center and corners. It shows at a peak secondary process flow of 20 mgd and a RAS flow of 6.5 mgd, the
MLSS concentration could be as high as 1,800 mg/L.
A-3
pw:\\Carollo/Documents\Client/CA/Veolia/10340A10/Deliverables/PM01\PM_FeasiibilityOfIncreasingSecondaryClarifierCapacity
Figure 3. Secondary Clarifier 1 (or 2) with a Suction-Type Mechanism, Concrete Fillets, and Increased RAS
Pumping at 2027 Peak Flow and Maximum Month Flow Conditions
Figure 3 shows at a peak secondary process flow of 20 mgd and a RAS flow of 13 mgd, the MLSS
concentration could be as high as 2,200 mg/L.
A-4
pw:\\Carollo/Documents\Client/CA/Veolia/10340A10/Deliverables/PM01\PM_FeasiibilityOfIncreasingSecondaryClarifierCapacity
Figure 4. Secondary Clarifier 1 (or 2) with a Suction-Type Mechanism and Concrete Fillets, at 2027 Maximum
Month Flow Conditions and MLSS = 2,800 mg/L
Figure 4 shows implementing a suction-type mechanism and concrete fillets at the bottom and corners of
SC-1 and SC-2 will provide improved sludge removal, compared to just adding a scraper-type mechanism.
The image on the right shows the corner fillets appear to keep the sludge out of the corners in the area that
is swept by the sludge withdrawal mechanism. The image on the left shows there is turbulence in the corner
area. Flow traveling along the walls appears to reflect back into the tank at the corner where it meets inflow
traveling outward.
A-5
pw:\\Carollo/Documents\Client/CA/Veolia/10340A10/Deliverables/PM01\PM_FeasiibilityOfIncreasingSecondaryClarifierCapacity
Figure 5. Sludge Blanket Depth with and without Corner Baffling
Secondary Clarifier 1 (or 2) with a Suction-Type Mechanism and Concrete Fillets, at 2027 Maximum Month Flow
Conditions and MLSS = 2,800 mg/L
A baffle was tested at the inside corners of the effluent weir to reduce the turbulence. As shown in Figure 5,
overall the baffle has a limited effect on sludge blanket height. Given the difficulty and cost of constructing a
baffle, it was dropped from further consideration.
A-6
pw:\\Carollo/Documents\Client/CA/Veolia/10340A10/Deliverables/PM01\PM_FeasiibilityOfIncreasingSecondaryClarifierCapacity
Figure 6. Sludge Blanket Depth with and without Increased RAS Pumping
Secondary Clarifier 1 (or 2) with a Suction-Type Mechanism and Concrete Fillets, at 2027 Maximum Month Flow
Conditions and MLSS = 2,800 mg/L
Figure 6 shows doubling the RAS pumping rate from 6.5 mgd to 13.0 mgd significantly lowers the sludge
blanket depth, and thereby improves secondary clarifier performance.
A-7
pw:\\Carollo/Documents\Client/CA/Veolia/10340A10/Deliverables/PM01\PM_FeasiibilityOfIncreasingSecondaryClarifierCapacity
Figure 7. Sludge Blanket Depth with a Suction-Type Mechanism and Concrete Fillets,
at Various Sludge Loading Rates (MLSS = 2,800 - 3,500 mg/L), and at Current and Future Maximum Month Flows
(15.2 = 17.3 mgd)
Figure 7, shows the secondary clarifier approaches failure when the MLSS concentration is increased to
3,500 mg/L. Operating at a high MLSS concentration (e.g., 3,000 mg/L - 3,500 mg/L) may be required in the
future to provide nutrient removal, such as nitrification and denitrification. As a result, more clarifiers would
likely be required to provide nutrient removal. Alternatively more aeration basins could be implemented to
reduce the MLSS concentration required for nutrient removal.
Digitally signed by Kathryn E. Rogers
Contact Info: Carollo Engineers, Inc.
Date: 2017.11.02 11:54:54-07'00'
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Date: 2017.11.02 10:58:17-07'00'
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Date: 2017.11.01 13:34:42-07'00'
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Date: 2017.11.01 13:33:23-07'00'
DATEREV BY DESCRIPTION
DATE
CHECKED
DRAWN
DESIGNED
10340A.10
JOB NO.
DRAWING NO.
SHEET NO.
SCALES ACCORDINGLY
VERIFY SCALES
THIS SHEET, ADJUST
IF NOT ONE INCH ON
BAR IS ONE INCH ON
ORIGINAL DRAWING
0 1"
OF 317OCTOBER 2017
VEOLIA
WWTP CRITICAL IMPROVEMENTS PROJECT
1 2 3 4 5 6 7 8 9 10 11 12 13
A
B
C
D
E
F
1 2 3 4 5 6 7 8 9 10 11 12 13
A
B
C
D
E
F
G G
®
No. 20740CONTROL DEVICESOPERATOR INTERFACE/FIELDPLC I/OCONTROL PANELSCADA/HMISECONDARY CLARIFIER NO. 1
CLR-1371
SECONDARY CLARIFIER NO. 1
1HP 480VAC 3PH
6
00NS06
CLR
1371
RAS
A 13N09
13N12
EFFLUENT CHANNEL
AERATION BASIN
SCUM
SOURCEPOWERKEY NOTES:
CONTROL PANEL TO BE LOCATED IN GALLERY STRUCTURE.
PRESERVED AND ADD FUNCTIONALITY AS SHOWN.
ENSURE THE EXISTING FUNCTIONALITY AT THE HMI IS
APPROPRIATE POINT.
AND CONNECT THE NEW CLARIFIER CONTROL PANELS TO THE
FIELD VERIFY EXISTING CLARIFIER I/O POINTS IN PLC SEC-TR2 1
3
2
3
MWH
1371
TSH
1371
XSHH
1371
TORQUE
XSH
1371
TORQUE
HAD
1371
ACTION
HOA
TAH
1371
ALARM
KI
1371
NUM
ETM
Y2
1371
ALARM
FAILED
Y1
1371
STATUS
RUNNING
YR
1371
STATUS
REMOTE
HAE
1371
ACTION
OO
ZSC
1371
SHEAR PIN
2
2
2
2
2
2
2
CR5
1371
ALARM
HIGH TORQUE
CR2
1371
ALARM
HIGH-HIGH TORQUE
CR3
1371
ALARM
SHEAR PIN
2
2
2
1
1
HSD
1371
HOA
HSU
1371
E-STOP
1
1
1
CR5
1371
DI
HIGH TORQUE
CR3
1371
DI
SHEAR PIN
CR2
1371
DI
HIGH-HIGH TORQUE
LCP
1371
2
2
2
2
2
2
II
1371
NUM
QIH
1371
SP
IR
1371
TREND
QIL
1371
SP
IAH
1371
ALARM
IAL
1371
ALARM
MS
1371
DO
OO
AUX1
1371
DI
RUNNING
1
I
1371
AI
CURRENT
HAE
1371
ACTION
OO
Y1
1371
STATUS
RUNNING
CR3
1371
ALARM
SHEAR PIN
CR2
1371
ALARM
HIGH-HIGH TORQUE
CR5
1371
ALARM
HIGH TORQUE
HAD
1371
ACTION
HOA
KI
1371
NUM
ETM
YR
1371
STATUS
REMOTE
Y2
1371
STATUS
FAILED
TAH
1371
ALARM
II
1371
NUM
QIH
1371
SP
IAL
1371
ALARM
IAH
1371
ALARM
IR
1371
TREND
QIL
1371
SP
DRAWING 13N11CONTINUED ON PROJECT NO.LAST SAVED BY:FILE NAME:
CAC
MCG
DSR
13N12
310
INSTRUMENTATION
SECONDARY CLARIFIER NO. 1
P&ID
10340A1013N012.dwgbshepard10340A.10Plot Date: 02-NOV-2017 5:10:37 PMUser: bshepard Model: Layout1 ColorTable: gshade.ctb DesignScript: Carollo_Std_Pen_v0905.pen PlotScale: 24.000001:1Digitally signed by Christopher Alan Carvalho
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B:\Pursuits\Client84(SAC)\STPUD\SecClarifierRehab\Prop0719\Resumes\BrittenMichael-2pg.docx
Education
BS Civil Engineering,
Arizona State University,
1974
Licenses
Civil Engineer, California
Professional
Affiliations
Water Environment
Federation
American Society of Civil
Engineers
American Water Works
Association
Michael J. Britten, P.E.
Michael Britten is a senior vice president with Carollo Engineers and has 45 years of
experience in master planning, design, and construction management of wastewater,
water, and storm water facilities.
Relevant Project Experience
Project manager for master planning,
final design, and construction management
services for the Sewer Authority Mid-
Coastside, California, Wastewater Treatment
Plant. The $17 million project included a 4-
mgd secondary treatment expansion and
new solids handling facilities.
Project manager for planning,
permitting, and design services for the
South San Francisco/San Bruno Water
Quality Control Plant Improvements. The
$41 million project involved expanding the
capacity from 9 to 13 mgd average dry
weather flow and providing for wet weather
treatment capacity of 62 mgd. Key elements
included adding a 110-foot-diameter
secondary clarifier, RAS pumping system,
and bar screen for wet weather flow.
"Liquid Package" manager for the $1.4
billion San Jose Regional Wastewater Facility
Capital Improvement Program. The liquid
stream projects total $360 million in project
costs. Major projects include aeration tank
rehabilitation, blower rehabilitation, tertiary
filters rehabilitation, secondary clarifier
rehabilitation, and a new headworks facility.
Responsible for contract management,
technical oversight, and mentoring for the
San Jose engineering staff.
Principal-in charge for preliminary and
final design of the City of Turlock, California,
Headworks and Secondary Treatment
Capacity Expansion Phase 1. The project
replaced an outdated headworks and
expanded the nitrification capacity of the
secondary treatment process.
Principal-in-charge/project manager for
the City of Modesto, California, 14.9 mgd
Biological Nutrient Removal/Tertiary
Treatment Facility, which included two
parallel membrane bioreactor facilities
totaling $150 million. The effluent produced
by the facility will be piped to the Delta
Mendota Canal and utilized by agricultural
customers that have seen drastic reductions
in their water allocations.
Principal-in-charge for design of the
Turlock Irrigation District, California, 1.2-MW
fuel cell cogeneration system at the City of
Turlock Water Reclamation Plant. The
project involved preparation of grants,
interconnection, permitting applications,
and prepurchasing equipment.
Principal-in-charge for the City of
Turlock, California, Tertiary Treatment
Facilities design and construction
management. The $50 million project
included a 20-mgd tertiary treatment
facility, new recycled water pump station,
and six-mile outfall/irrigation pipeline to
serve agricultural customers.
Principal-in-charge for the City of
Burlingame, California, $8 million
Wastewater Treatment Plant Improvements.
The project included replacement of the
aeration system, new blowers, and a sludge
dewatering building.
Principal-in-charge/project manager for
the City of Turlock, California, Nitrification
Facilities Design. The $8.1 million project
involved evaluation of alternatives to
expand the trickling filter/activated sludge
process to permit nitrification. The plant will
be expanded to 15.5 mgd by constructing
two new aeration basins. The design
converts three existing aeration basins from
floating covers to fine bubble aeration and
adds four new 400-hp centrifugal blowers
to supply air to the existing aeration basins.
Project manager for design of the Union
Sanitary District, California, $36 million
Wastewater Treatment Plant Upgrade. The
project increased plant capacity to 30 mgd
and included activated sludge processes, an
88-foot-diameter anaerobic digester, and
sludge thickening facilities. Responsible for
obtaining State Revolving Fund loans,
negotiating with Pacific Gas and Electric to
relocate high voltage lines, and obtaining
Michael J. Britten, P.E.
B:\Pursuits\Client84(SAC)\STPUD\SecClarifierRehab\Prop0719\Resumes\BrittenMichael-2pg.docx
permits from the Bay Area Air Quality
Management District.
Project manager for design of the North
San Mateo County Sanitation District (City
of Daly City), California, $16 million plant
expansion. The project provides 2.8 MG of
flow equalization storage basins and new
primary sedimentation basins to expand the
activated sludge plant from 8 to 10.3 mgd.
The equalization basins also provide wet
weather flow storage.
Project engineer for design of the East
Bay Municipal Utility District, California, Main
Wastewater Treatment Plant $5 million
waste activated sludge thickening facility
and modifications to the primary sedimen-
tation basin influent channels and prechlo-
rination system.
Project manager for the Central Contra
Costa Sanitary District, California,
Comprehensive Wastewater Master Plan,
which encompasses a $1.8 billion capital
improvement program for the collection
system and wastewater treatment plant.
Treatment plant improvements identified
include replacement of the steam-driven
aeration system with a new electric blower
system and revamping of the entire solids
handling facilities.
Project manager for design and
construction management services for the
East Bay Municipal Utility District, California,
Wastewater Treatment Plant $24 million
Wet Weather Storage Basin. The project
included an 11-MG storage basin, 120-mgd
flow diversion facilities, and 80-mgd
submersible pump station.
Project manager for the City of South
San Francisco, California, Wet Weather
Program, which included an infiltration and
inflow analysis and development of a capital
improvement program for the collection
system and main pump stations.
Principal-in-charge/project manager for
the City of Modesto, California, Wastewater
Master Plan for collection system and
treatment/effluent disposal facilities. The
City’s 20-year capital improvement plan
includes $500 million in improvements.
Project manager for the City of Stockton,
California, 55-mgd Regional Wastewater
Control Facility Capital Improvement and
Energy Management Plan. Developed a 5-
year, $150 million capital improvement
program.
Principal-in-charge/project manager for
the City of Turlock, California, Recycled
Water Feasibility Study. The study identified
potential uses for recycled water, including
groundwater recharge and crop irrigation,
and developed required treatment facilities
for a 20-mgd recycled plant.
Principal-in-charge for the City of
Burlingame, California, Wastewater
Treatment Facility Study. The study
evaluated alternatives for upgrading and
expanding the plant to accommodate wet
weather flows. The study included a capacity
evaluation and a reliability audit of the
existing facilities.
Project manager for the Sewer Authority
Mid-Coastside (SAM), California, Wet
Weather Management Program. The
project involved monitoring wet weather
flows and rainfall in Half Moon Bay, El
Granada, and Montara to evaluate the wet
weather capacity of the intertie pipeline
system. The intertie system conveys
wastewater from these communities to the
SAM treatment plant. Carollo prepared a
facility plan that identified $8 million in
capital improvements, which included wet
weather storage basins, parallel force main,
and increased capacity for a major pump
station.
Project manager for the City of Fort
Bragg, California, $9 million Water Source
Development Project. The project studied
the feasibility of installing a new river intake,
raw water pumping station, raw water
transmission pipelines, and 1,500-acre-foot
reservoir. The project scope also included a
recycled water feasibility study. The new
facilities would allow Fort Bragg to eliminate
river diversions in the dry season when flows
are low and minimum fish bypass flows
cannot be maintained. Pumping would
occur only during the wet season and
excess flow would be stored in the reservoir
to satisfy summer demands.
B:\Pursuits\Client84(SAC)\STPUD\SecClarifierRehab\Prop0719\Resumes\ParkerScott-2pg.docx
Education
MS Environmental
Engineering, University of
California, Berkeley, 1992
BS Civil Engineering,
University of California,
Los Angeles, 1991
Licenses
Civil Engineer, California
Professional Engineer,
Hawaii
Professional
Affiliations
California Water
Environment Association
Water Environment
Federation
American Academy of
Environmental Engineers,
Board Certified
Scott E. Parker, P.E., BCEE
Scott Parker, a senior vice president with Carollo Engineers, serves as the firm’s Chief
Engineer. As Director, he leads the development and updates to all of Carollo’s
engineering standards, including computer aided design, standard specifications,
typical details, and cost estimating. He has completed a wide array of projects in
planning, design, and construction of wastewater systems.
Relevant Project Experience
Principal-in-charge/project manager for
design and construction of the South Tahoe
Public Utility District, California, $10 million
Headworks Replacement. The project
included new metering, screening, and grit
removal systems, as well as demolition of
existing plant infrastructure to include the
existing headworks, grit facilities, and an
abandoned incineration building.
Principal-in-charge for the South Tahoe
Public Utility District, California, Twin Peaks
Booster Station and Water Line
Replacement. The project included design
of a booster station with three 875-gpm
vertical turbine pumps, an emergency
generator, and replacement of 10,000 feet
of 12-inch water transmission pipeline. The
waterline replacement consisted of
provisions for bidding alternative
construction techniques such as remove
and replace, pipe bursting, and cured-in-
place technologies.
Project engineer for the South Tahoe
Public Utility District, California, $9 million
Sludge Handling and Odor Control Facilities.
The project involved prepurchase of two
centrifuges and design and construction of
a dewatering building, liquid sludge storage
facilities, cake conveyance and storage,
remote sludge pumping, polymer addition,
and odor control equipment.
Principal-in-charge for the City of Chico,
California, $45 million Water Pollution
Control Plant Expansion to 12 mgd, average
day average month capacity. New facilities
included headworks, aeration tanks,
aeration blowers, secondary clarifier, RAS
pump, primary sludge and scum thickening
pumps, anaerobic digester and appurtenant
facilities, centrifuge, cogeneration unit,
standby generator, sludge storage and
processing areas, and constructed wetlands
for enhancement and effluent polishing.
Principal-in-charge/project manager for
the Fairfield-Suisun Sewer District, California,
$22 million Secondary Treatment Expansion,
which includes conversion of an
intermediate clarifier, integration of anoxic
selectors into converted aeration basins,
new secondary clarifiers, new RAS pump
station, and odor control.
Project manager/engineer for design of
the City of Chico, California, $33 million 9-
mgd nitrification improvements. The project
included headworks modifications, primary
clarifiers, anaerobic digesters and control
building, centrifuge dewatering building,
chlorine contact basins, sodium
hypochlorite and sodium bisulfite
disinfection, 48-inch outfall pipe,
administration building, electrical and
instrumentation upgrades, aeration basins,
secondary clarifiers, RAS pumping, aeration
blowers, and yard piping. Also responsible
for development of the hydraulic model and
process calculations.
Discipline engineer for the peak-flow,
full-scale hydraulic testing and analysis of
the City of Santa Rosa, California,
Wastewater Treatment Plant secondary
clarifiers.
Peer review for the Inland Empire
Utilities Agency, California, RP-1 Liquids and
Solids Recovery. The project involved design
for rehabilitation of existing headworks and
primary clarifiers, improvements to yard
piping, aeration basin modification, and new
fine screens, process blowers, solids
thickening facility (using rotary drum
thickeners), acid-phase digesters, odor
control systems, and electrical service feed.
Project manager for the Fairfield-Suisun
Sewer District, California, $11 million Primary
Treatment Expansion. This expansion
increased the primary treatment capacity of
the existing plant by one-third, to an annual
average dry weather flow of 23.7 mgd. The
Scott E. Parker, P.E., BCEE
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project included design of a 95-foot-
diameter circular clarifier; vortex grit
removal basin; related sludge, scum, and
grit pumping stations; grit handling facility;
and grit basin influent flow channels fitted
with Parshall flumes used for both flow
measurement and flow splitting.
Principal-in-charge for the Union
Sanitary District, California, Primary Digester
No. 3 Rehabilitation and Solids System
Capacity Assessment Report. Digester
improvements included upgrades to the
piping associated with pumped mixing,
heating, sludge transfer, and digester gas
systems, as well as concrete repairs and
foam insulation replacement to address
structural and safety deficiencies.
Principal-in-charge for the Union
Sanitary District, California, High-Speed
Aeration Blower Replacement. The project
entailed demolition of existing positive
displacement rotary lobe blowers and
replacement with a high-speed, dual-core
turbo blower and associated piping and
electrical improvements.
Principal-in-charge for the Fairfield-
Suisun Sewer District, California, Blower
Replacement, which enhanced the reliability
and efficiency of the secondary treatment
process aeration system. The project
involved a secondary treatment process
evaluation of the activated sludge process,
replacement of the 600-hp aeration blowers
with new high-speed turbo blowers,
aeration piping repairs, standby power
generation, and electrical system upgrades.
Principal-in-charge for the Union
Sanitary District, California, Alvarado
Wastewater Treatment Plant Solids
System/Capacity Assessment. The plant’s
influent flows have been steadily decreasing
while influent TSS and BOD mass loading
rates have been increasing. This project
involved an assessment of existing capacity
and ways to increase solids treatment
capacity, optimize solids processes, achieve
energy neutrality, and produce Class A
biosolids. An evaluation of potential
regulatory changes was also included.
Project manager for the Sacramento
Regional County Sanitation District,
California, EchoWater Project Flow
Equalization Project (FEQ). This $129 million
project added 110 MG of storage to existing
basins to reduce peak flows to 330 mgd
and provided mass excavation for future
facilities. The project required 1,200,000 CY
of excavation and more than 85,000 truck
trips to remove excavated material from the
site. FEQ includes two major pumping
stations, concrete lining, washdown system,
large fill/drain piping, and major effluent
control structures.
Project manager for the Sacramento
Regional County Sanitation District,
California, EchoWater Project Nitrifying
Sidestream Treatment Project (NST). This
$50 million project will use nitrifying
sequencing batch reactors to reduce
ammonia in the solids treatment system
supernatant necessary to meet interim
permit conditions. It will also produce
nitrate-rich effluent for odor control. NST
includes influent and effluent pumping and
lime addition. The project was accelerated
to save $1.1 million per year in avoided
sodium hypochlorite costs.
Design manager for the Sacramento
Regional County Sanitation District,
California, EchoWater Project Tertiary
Treatment Facilities Project (TTF). This $400
million project will provide filtration and
disinfection of secondary effluent to a level
equivalent to Title 22 requirements for
tertiary disinfected recycled water for
unrestricted reuse. TTF includes a 330-mgd
filter influent pump station, 217 mgd of
granular media filters, backwash
equalization and treatment, chemical feed
systems, covered disinfection contact basin,
and a new area control center.
Quality assurance/quality control for the
Albuquerque Bernalillo County Water Utility
Authority, New Mexico, Southside Water
Reclamation Plant Solids Dewatering Facility
Replacement. The existing facility did not
provide reliable service, required significant
maintenance, and was at the end of its
useful life. The project involved preliminary
design, Design Analysis Report, permits and
site approvals, detailed design (including
construction bid documents), and
engineering services during construction.
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Education
MS Civil and
Environmental
Engineering, University of
California, Davis, 2006
BS Civil Engineering,
California State
University, Fresno, 2004
Licenses
Civil Engineer, California
Certification
10-Hour Construction
Safety and Health,
Occupational Safety and
Health Administration,
California, 10/18/2007
Professional
Affiliations
California Water
Environment Association
Water Environment
Federation
American Water Works
Association
Hydraulic Institute
Canvassing Committee
Richard L. Gutierrez, P.E.
Ricky Gutierrez joined Carollo Engineers in 2001 and has been involved in a broad
range of projects, including planning, design, and construction of wastewater
treatment facilities, water treatment facilities, pipelines (including trenchless
technology evaluations), river outfalls and diffusers, and pump stations. His
experience also includes research and evaluation of disinfection technologies such as
UV, pasteurization, and ozone for water reuse projects.
Relevant Project Experience
Design engineer and resident engineer
during construction of the City of Chico,
California, 12-mgd Water Pollution Control
Plant Expansion. The project expanded the
plant capacity from 9 mgd to 12 mgd and
involved construction of a new headworks
facility, grit basins, aeration tanks, secondary
clarifier, digester, modifications to existing
pump stations, and various other
improvements. Responsible for design and
engineering services during construction for
aeration tanks, sludge drying beds,
hydropneumatic plant water tank, primary
effluent pump station modifications,
thickened sludge pump station, yard piping,
and civil site work. Also provided
construction inspection, submittal review,
responses to requests for information,
coordination of construction progress
meetings, field instructions and design
clarifications, and review of change orders
and as-built drawings.
Project engineer for the South Tahoe
Public Utility District, California, Process and
Hydraulic Analysis. The project involved a
process and hydraulic evaluation of the
Wastewater Treatment Plant, focusing on
the activated sludge unit process. District
staff was interested in determining the near-
term and possible long-term process needs
in order to set appropriate priorities for
future capital expenditures. Carollo’s
analysis provided recommendations for
meeting current and future peak plant flow
demands and prioritized these capital
improvements. The project also evaluated
the performance and feasibility of
alternative treatment configurations
intended to optimize plant performance
and improve hydraulic capacity.
Project manager for the Fairfield-Suisun
Sewer District, California, Blower
Replacement, which enhanced the reliability
and efficiency of the secondary treatment
process aeration system. The project
consists of a secondary treatment process
evaluation of the activated sludge process,
replacement of the existing 600-hp aeration
blowers with new high-speed turbo
blowers, aeration piping repairs, and
electrical system upgrades.
Project engineer for the Sacramento
Regional County Sanitation District,
California, EchoWater Project $32 million
Return Activated Sludge Pumping Project
(RAS). RAS will replace existing return
activated sludge pumps with new pumps
designed to deliver the higher flow and
head conditions required by the new
biological nutrient removal process. RAS will
have a capacity of over 200 mgd and
includes 48 pumps located at 24 secondary
sedimentation tanks. Carollo completed
preliminary design of the system including
hydraulic modeling, recommendations on
pump selection, an electrical load study that
recommends changes to the existing power
distribution system, and an instrumentation
and control systems review that
recommends changes for improved control
and monitoring. The design also
incorporated replacement of the coarse
bubble channel aeration system in the
mixed liquor channels.
Engineering services during construction
for the Fairfield-Suisun Sewer District,
California, Secondary Treatment Expansion,
which included modifications to several
existing plant pump stations, conversion of
existing aerobic digesters to aeration tanks,
and a new return activated sludge pump
station. Responsible for submittal review,
responding to requests for information, and
preparing design clarifications.
Project engineer for the Sacramento
Regional County Sanitation District,
California, EchoWater Project $50 million
Richard L. Gutierrez, P.E.
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Nitrifying Sidestream Treatment Project
(NST). NST will use nitrifying sequencing
batch reactors to reduce ammonia in the
solids treatment system supernatant
necessary to meet interim permit
conditions. It will also produce nitrate-rich
effluent for odor control. NST includes
influent and effluent pumping and lime
addition. The project was accelerated to
save $1.1 million per year in avoided sodium
hypochlorite costs.
Project engineer providing final quality
assurance/quality control review for the
Union Sanitary District, California, High-
Speed Aeration Blower Project. The project
entailed demolition of existing positive
displacement rotary lobe blowers and
replacement with a high-speed, dual-core
turbo blower and associated piping and
electrical improvements.
Engineer for the City of Daly City,
California, Wastewater Treatment Plant
Feasibility Study for Tertiary Treatment
Expansion. The project evaluated the
feasibility of expanding the tertiary
treatment facilities at the existing
wastewater treatment plant and included an
analysis of several disinfection and filtration
technologies. The technologies evaluated
included in-vessel UV systems, ozone
disinfection systems, a pasteurization
system, and microfiltration membrane
systems. Responsible for analysis of
disinfection and filtration technologies, site
configuration and layout, cost analysis,
development of design alternatives, and
report preparation.
Engineer for the performance evaluation
of the Quay Technologies limited low-
pressure, high-output microwave generated
UV system in Roseville, California. Testing
was conducted in accordance with the
National Water Research Institute/Water
Research Foundation UV guidelines to
receive conditional acceptance by California
Department of Public Health to be used for
Title 22 water recycling applications.
Engineer for the Rancho Murieta
Community Services District, California,
Wastewater Treatment Plant Operational
Audit. The project consisted of a review of
one year of operating data, review of
previous engineering studies, site
assessments, interview of operators, and
preparation of an assessment report with
recommendations on how to make the
facility operate better and reduce the
potential for future odor problems from the
plant. Responsible for data review and
report preparation.
Design engineer for the City of Roseville,
California, Pleasant Grove Wastewater
Treatment Plant Phase I Expansion and UV
Design Assist projects. These projects
included expansion of primary and
secondary treatment facilities and
conversion of the disinfection process from
chlorine to UV. Responsible for site work
design, stormwater calculations, hydraulic
calculations, and coordination between
discipline engineers.
Resident engineer for the City of Chico,
California, Water Pollution Control Plant
Outfall Replacement. The project consisted
of construction of an 84-inch diameter
reinforced concrete pipeline, 63-inch
diameter HDPE pipe with diffusers installed
in the Sacramento River using the float and
sink method, junction structures, and outfall
gate structure. Responsible for construction
inspection, submittal review, responses to
requests for information, construction
progress meetings, preparation of field
instructions/design clarifications, and review
of change orders and as-built drawings.
Resident engineer for the City of
Roseville, California, Dry Creek Wastewater
Treatment Plant Chlorine Conversion to UV
Disinfection construction. The project
consisted of construction of a 45-mgd UV
disinfection system capable of producing
disinfected tertiary recycled water in
accordance with Title 22, construction of an
onsite sodium hypochlorite generation
system to provide chlorine residual to the
recycled water distribution system, and
conversion of existing chlorine contact
basins to recycled water storage tanks.
Responsible for submittal review,
responding to requests for information,
preparing field instructions and design
clarifications, reviewing as-built drawings,
and construction inspection.
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Education
MS Civil Engineering,
Hydraulics, Washington
State University, 2000
BS Civil Engineering,
Washington State
University, 1998
Licenses
Civil Engineer,
Washington, California,
Florida
Professional
Affiliations
Water Environment
Federation
American Water Works
Association
International Water
Association
Hydraulic Institute
Edward A. Wicklein, P.E.
Edward A. Wicklein has 21 years of experience in design and analysis of hydraulic
facilities using numerical models. He has experience in all phases of modeling
including code development, grid generation, flow analysis, and data visualization. He
has conducted many computational fluid dynamic (CFD) studies of municipal and
industrial water facilities. These projects have included pump intake modeling,
reservoir modeling, raw water intake design and analysis, outfall design and analysis,
modeling of junctions and flow splits, and detailed modeling of most of the major
water and wastewater treatment components and processes.
Relevant Project Experience
Project engineer for the South Tahoe
Public Utility District, California, Headworks
Replacement. Assisted on a study to
develop the preliminary hydraulic layout of
a portion of the new headworks. CFD
modeling was used to optimize flow split
and velocity distribution in the channels
between headworks screens, through vortex
grit tanks, to Parshall flumes leading to
primary clarifiers.
Project engineer for the Dallas Water
Utilities, Texas, Central Wastewater
Treatment Plant Improvements. Evaluated
inlet improvements for a 195-foot-diameter
secondary clarifier. Modeling incorporated a
custom density-coupled sedimentation
model. A new target baffle design was
developed with the model that better
dissipated inlet energy and improved
sedimentation in the large tanks.
Project engineer for the West County
Sewer District, California, Secondary Clarifier
Improvements. Facility planning determined
that two of the clarifiers should have
additional capacity. A custom solids
transport model was used with the
commercial CFD model to evaluate inlet
baffle improvements to increase the
sedimentation capacity of the existing tanks.
Project engineer for CFD modeling of
Vallejo Sanitation and Flood Control District,
California, Secondary Clarifiers. The District
was considering potential inlet energy
dissipation improvements. The CFD model,
along with a custom sedimentation model,
was used to evaluate performance
improvements for a range of commercially
available products, as well as some simple
modifications.
Project engineer responsible for
developing CFD models of secondary
sedimentation distribution channel and
basins for the West County Sewer District,
California. Four rectangular secondary
clarifiers were supplied by two aeration
basins via a rectangular channel, in a
symmetrical arrangement. Conducted
modeling to find gate settings that balanced
flow between the clarifiers and to determine
the capacity of the two clarifier designs.
Project engineer responsible for
developing a CFD model of a flow splitting
structure for City of Daly City, California,
Wastewater Treatment Plant. Flow from the
aeration basins is combined in a well-up
box, then divided between three secondary
clarifiers via weirs. A 3D free-surface CFD
model was used to ensure the geometry of
the inflow piping did not lead to non-
uniform flow split between the clarifiers.
Project engineer for development and
analysis of a flow splitting structure CFD
model as part of a wet weather treatment
capacity upgrade for the Central Marin
Sanitation Agency, California. The project
involved expanding treatment capacity by
adding treatment facilities. The existing flow
distribution structure is symmetrical. Work
included adding two clarifiers on one side,
connected by an extension channel. At the
proposed peak wet weather flow, the split
between the clarifiers will be adjusted with
gates at the clarifier entrances. The CFD
model provided a basis for estimating the
range of gate openings required to balance
the flow between the clarifiers.
Project engineer responsible for CFD
modeling for the City of Loveland,
Colorado, secondary clarifiers. The City
currently has three secondary center-feed
clarifiers. Peak flows are projected to
Edward A. Wicklein, P.E.
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increase 20 percent in the coming years.
CFD modeling showed that the projected
flow increase would likely lead to failure of
the clarifiers as they were configured. The
model was used to develop an improved
inlet energy dissipation system that
provided increased capacity within the
existing tanks, thereby delaying the need for
an additional tank.
Project engineer responsible for
developing CFD models of the secondary
clarifier flow splitting structure and
secondary clarifiers for the City of Glendale,
Arizona, Arrowhead Wastewater Treatment
Plant. The flow splitting structure had an
asymmetric weir arrangement, leading to
unbalanced clarifier flows. The model was
used to find weir settings that would lead to
balanced flows at peak conditions. The plant
has two styles of rectangular clarifiers. The
newer ones have higher effluent suspended
solids than the original set. CFD modeling
was used to find the cause of the difference
and develop baffling improvements to
improve sedimentation in the newer
clarifiers.
Project engineer responsible for
developing a CFD model of the Secondary
Clarifiers at the City of Longmont, Colorado,
Wastewater Treatment Plant. The model
was used to develop improvements to
increase the capacity of the existing clarifier,
allowing the City to postpone construction
of a second clarifier.
Project engineer responsible for
developing a CFD model of a secondary
clarifier flow splitter structure for the City of
Everett, Washington. The city currently has
two secondary clarifiers. Flow is split
between them in a structure designed to
supply up to four clarifiers. A third clarifier is
being added, which will create a non-
symmetrical arrangement. A free-surface
CFD model was used to evaluate weir
settings and other improvements to create
balanced flow at a range of conditions.
Project engineer responsible for
developing and implementing a density
coupled sedimentation model to estimate
the performance of proposed clarifiers for
the Seonam Water Reclamation Plant in
Seoul, South Korea. The rectangular
secondary clarifiers were highly loaded and
utilized lamella plates to aid in
sedimentation. The model was also used to
evaluate the impact of baffling on
sedimentation.
Project engineer responsible for CFD
modeling of wet weather treatment
headworks for the San Francisco Public
Utilities Commission, California. The CFD
model was used to evaluate bar screen
channel alternative configurations that
would work in the available space. Modeling
was also performed to optimize the
configuration of the channels approaching
the vortex grit tanks and provide balanced
and uniform flow conditions.
Project engineer responsible for CFD
modeling of the Plant 1 headworks for the
Orange County Sanitation District,
California. Two models were developed, one
of the pump station and one of the grit
tanks. The pump station model was used to
investigate options to increase the peak
flow from 280 mgd to 320 mgd reusing as
much of the existing wet pit/dry pit
infrastructure as practical. A model was also
develop of the existing aerated grit tanks to
evaluate options to similarly increase
capacity, as well as generally increase
performance. The model included grit
particle tracking bases on field grit
measurements to quantify performance and
compare geometric changes.
Project engineer responsible for CFD
modeling of the open channel UV system
hydraulics for the City of Lodi, California.
The existing UV equipment was due for a
complete lamp replacement. The study
evaluated the potential for equipment
upgrade, as well as evaluated the current
system hydraulics to determine if minor
improvements to the facility configuration
could improve system efficiently. The model
showed that the high headloss flow
distribution baffle did not do a very good
job of creating uniform flow conditions at
the first lamp bank, and instead a lower
head loss baffle and turning vanes would
provide better hydraulics for the UV system.
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Education
BS Civil Engineering,
Arizona State University,
1996
Licenses
Civil Engineer, California
Structural Engineer,
California, Nevada,
Hawaii
Civil/Structural Engineer,
Washington, Oregon
Professional
Affiliations
American Society of Civil
Engineers
Chi Epsilon (National Civil
Engineering Honor
Society)
Engineers Without
Borders, Technical
Advisory Committee
Structural Engineers
Association of Northern
California
Tau Beta Pi (National
Engineering Honor
Society)
NACE International
Society for Protective
Coatings, Northern
California Chapter
Steering Committee
Governor's Office of
Emergency Services,
ATC-20 Trained
Responder
Mike E. Dadik, P.E., S.E.
Mike Dadik has 28 years of experience in structural design of water, wastewater, and
civil engineering projects. He has overseen the structural design of numerous projects
ranging from water and wastewater treatment plant construction and expansion to
pump station seismic retrofits. Mike has extensive experience in rehabilitation and
seismic vulnerability assessments. He has extensive experience in coating and
corrosion control and is Carollo’s coating specialist responsible for maintenance of
our coatings and finishes specifications.
Relevant Project Experience
Structural engineer for the South Tahoe
Public Utility District, California, $9 million
Sludge Handling and Odor Control Facilities.
The new 7,400-square-foot masonry
building houses new centrifuges and sludge
handling equipment, and a new steel tank
was constructed for sludge storage.
Structural engineer for the South Tahoe
Public Utility District, California, $10 million
Headworks Replacement. The project
consists of new metering, screening, and
grit removal systems in a new two-story,
4,500-square-foot, cast-in-place concrete
and masonry building. Innovative
approaches were utilized to mitigate the
corrosive environment and maintain
separation between building classification
occupancies.
Structural engineer for preliminary and
final design of the City of Turlock, California,
Headworks and Secondary Treatment
Capacity Expansion Phase 1. The expansion
replaced an outdated headworks and pump
station and provided additional influent
pumping capacity to handle future flows.
Structural engineer for assessment and
preliminary/final design of the Union
Sanitary District, California, Primary Clarifier
Rehabilitation. The project involved concrete
repair, seismic upgrades, and replacement
of four primary clarifier mechanisms, which
are housed in a 14,400-square-foot facility.
Two clarifiers had to remain in service
during construction, which complicated
construction sequencing and cost
estimating.
Structural engineer for preliminary and
final design of the Fairfield-Suisun Sewer
District, California, $22 million Secondary
Treatment Expansion, which involved design
of an intermediate clarifier, influent pump
station, biofilter, aeration basin retrofits, two
secondary clarifiers, new RAS pump station,
and odor control.
Structural engineer for preliminary and
final design of the City of San Leandro,
California, Water Pollution Control Plant
Rehabilitation to restore the plant to its
permitted capacity of 7.6 mgd with various
facility improvements and addition of new
facilities. Major work included construction
of a new headworks and influent pump
station, circular primary clarifier, primary
effluent flow equalization facilities, and
covered, fixed film reactor with associated
lift station and biofilter facility.
Project manager for the Primary Clarifier
Inspection for Delta Diablo Sanitation
District, California. The project included
visual inspection of the plant's primary
clarifier concrete slab and walkway and
recommendations for repair.
Structural engineer for the Delta Diablo
Sanitation District, California, Primary
Clarifier Improvements. Responsible for
design of concrete and coating repair of the
clarifiers and primary sludge pump station.
Structural engineer for preliminary and
final design of the Fairfield-Suisun Sewer
District, California, $11 million Primary
Treatment Expansion. Work involved design
of a new circular primary clarifier, vortex grit
basin, primary sludge and scum pump
stations, biofilter, and electrical building.
Structural engineer for the City of
Modesto, California, new $120 million Phase
2 Biological Nutrient Removal/Tertiary
Treatment Facility. The project involved
preliminary and final design of new 12.6-
mgd aeration basins and membrane
bioreactors (MBR), enclosed UV disinfection
system, large bridge crane structure, and
masonry buildings. Site preparation
Mike E. Dadik, P.E., S.E.
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required mitigation of soft soils including
soil modification and development of cost-
effective, below-grade piping connections.
Was structural engineer of record leading a
team of five structural design engineers.
Designed the aeration basins and MBR
structures.
Structural engineer for the City of
Modesto, California, $20 million Phase 1A
Treatment Plant Expansion. The project
involved design of a new 1.2-mgd oxidation
ditch and membrane bioreactors, UV
disinfection system, bridge crane structure,
and several masonry buildings.
Structural engineer for the San Francisco
Public Utilities Commission, California,
Southeast Plant SEP 020 Headworks. The
new headworks will improve the treatment
efficiency of screening and grit removal,
while maximizing the control of odors. The
250-mgd replacement headworks includes
influent diversion, bar screens, screenings
handling, grit basins and handling, primary
flow splitting, odor control scrubbers, and
an electrical building.
Structural engineer for the City of
Woodland, California, Aeration Retrofit. The
City’s wastewater treatment plant is rated
for 10.4 mgd, but has insufficient aeration
capacity for the rated flow. In addition, the
plant is expected to have nitrate limits in the
future; therefore, process modifications are
needed. Designed improvements to
increase aeration capacity and convert the
oxidation ditch process to a Modified
Ludzack-Ettinger (MLE) configuration.
Improvements included replacing brush
rotors in the oxidation ditch with more
energy efficient diffused air and fine bubble
aeration and partitioning the oxidation ditch
and adding necessary mixers and internal
pumping to convert to the MLE process,
which will further reduce energy demands.
Project manager/structural engineer for
the Delta Diablo Sanitation District,
California, Primary Influent Pipeline and Grit
Chambers Repairs. The project involved
rehabilitation of 140 feet of 42-inch primary
influent piping using the CIPP method,
repair of damaged concrete at the aerated
grit chambers, and application of protective
coatings over damaged concrete surfaces.
Unique aspects of this fast-track project
included detailed construction sequencing
and bypass pumping planning to enable
rehabilitation of the pipeline and channels
while maintaining reliable plant operations.
Structural engineer for design and
construction of the California Department of
Corrections and Rehabilitation $35 million
Deuel Vocational Institution new wastewater
treatment plant. The new membrane
bioreactor facility had below-grade cast-in-
place concrete tanks and above-grade
masonry and steel buildings. Challenges
included extensive site work to raise the
buildings above the flood level and mitigate
uplift potential for below-grade tanks.
Structural engineer for the City of San
Jose, California, San Jose/Santa Clara Water
Pollution Control Plant Headworks
Condition Assessment. The project involved
a detailed condition assessment of the
original influent pumping, screening, and
pretreatment facilities by a multidisciplinary
team (structural, mechanical, process,
electrical, and instrumentation). Input from
the condition assessment was used to
estimate replacement costs and timing for
keeping the original headworks in use until
2040. Efforts tied into a parallel analysis on
the costs and timing for expanding the new
headworks facilities if the City chose to
decommission the original headworks.
Structural engineer for the Delta Diablo
Sanitation District, California, Secondary
Solids Thickening Design, which involves
evaluation and design of a new 2-meter
gravity belt thickener to be located within
the plant’s existing abandoned DAF Tank
No. 3. A new open canopy structure is
provided to house the existing and new
gravity belt thickeners.
Project manager for the City of Palo
Alto, California, Regional Water Quality
Control Plant Repair and Retrofit. The
project involved design to rehabilitate aging
plant facilities through two construction
projects, assessment of the structural
integrity of the foundations of the
operations and solids incineration buildings,
and additional minor facility assessments.
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Education
BS Mechanical
Engineering Technology,
California State
University, Sacramento,
2000
Licenses
Electrical Engineer,
California
Daniel S. Robinson, P.E.
Daniel Robinson has 20 years of electrical and control systems experience in the
water and wastewater industry. He is proficient in 480VAC electrical distribution
systems; variable frequency drives (VFDs), reduced voltage soft starter (RVSS), and
full-voltage (FV) motor control design; supervisory control and data acquisition
(SCADA), programmable logic controller (PLC) and industrial control panel design;
control system architecture; serial, Ethernet, and radio communication; process
instrumentation; water/wastewater treatment processes; project management; UL,
NEC, NEMA, and NFPA 70E requirements; and relay and ladder logic. Daniel’s primary
responsibilities have included design of switchgear, motor control centers (MCCs),
PLC panels, and instrumentation, control, and communication systems; creation of
interconnection diagrams for power and control wiring between project equipment;
creations of input/output (I/O) lists, loop diagrams, training documents, and factory
and field test documentation; and development of control system descriptions, and
operations and maintenance (O&M) manuals.
Relevant Project Experience
Electrical/instrumentation and controls
manager for the City of Hughson, California,
Wastewater Treatment Plant Expansion,
which included main lift station, headworks,
oxidation ditch, and secondary clarifier. The
project also included a 480V utility metering
switchboard with automatic transfer switch,
surge protective device, and power monitor;
MCCs with VFDs, active harmonic filter,
RVSS, and reversing and non-reversing
starters; control panels with Allen-Bradley
ControlLogix PLCs, Ethernet, fiber optic, and
radio communications to a new SCADA
system; field instrumentation with flow, level,
pressure, dissolved oxygen, and total
suspended solids monitoring; coordination
of intrinsically safe requirements; and loop
diagrams, uninterruptible power supply load
calculations, testing, and training.
Electrical/instrumentation and controls
manager for the City of Reno, Nevada,
Reno/Stead Water Reclamation Facility
Expansion, which included headworks,
oxidation ditch, aeration basin, secondary
clarifier, tertiary filters, chlorine contact
basin, and effluent structure. The project
also included 15KV main switchgear, 5KV
switchgear with automatic transfer switch
and power distribution, 480V power
distribution with surge protective device and
power monitors; MCCs with 18-pulse VFDs,
6-pulse VFDs, and non-reversing starters
with electronic overload and smart relay
controls; control panels with Modicon
Quantum PLCs and Modicon HMI; MB+
fiber optic ring communications to a new
SCADA system; field instrumentation with
flow, level, pressure, dissolved oxygen,
oxidation reduction potential, and
hazardous gas monitoring; coordination of
intrinsically safe requirements; and power,
control, and communication
interconnection diagrams, testing, training,
and final documentation.
Instrumentation and controls engineer
for the Sacramento Regional County
Sanitation District, California, EchoWater
Project Return Activated Sludge Pumping
Project (RAS). This $32 million project will
replace existing return activated sludge
pumps with new pumps designed to deliver
higher flow and head conditions required
by the new biological nutrient removal
process. The RAS pumping system has a
capacity greater than 200 mgd and includes
48 pumps located at 24 secondary
sedimentation tanks. Preliminary design
included hydraulic modeling, pump
selection recommendations, electrical load
study that recommended changes to the
existing power distribution system, and
instrumentation and control systems review
that recommended changes for improved
control and monitoring.
Electrical/instrumentation engineer for
design and engineering services during
construction for the City of San Mateo,
California, Wastewater Treatment Plant
Process Control System Upgrade and
Collection System SCADA Integration. The
project involved replacement of most of
PLC control panels in the plant with an
Daniel S. Robinson, P.E.
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Allen-Bradley ControlLogix PLC system,
replacement of the SCADA system with a
new SCADA system that includes remote
view nodes located in all of the major
process areas of the plant, and installation
of a fiber optic backbone communication
network extending the PLC network, SCADA
network, and business network throughout
the entire plant. Installation of the control
system was done in phases with complex
sequencing to reduce facility downtime and
ongoing City and contractor coordination.
Electrical/instrumentation and controls
manager/supervisor for the National Park
Service EI Portal Wastewater Treatment
Plant Upgrade in Yosemite National Park,
California. The project involved design
services, construction, and field installation
to rebuild the main control and filter control
panels, fiber optic communications, and a
new SCADA system. Tasks included field
investigations, design proposals, and cost
estimates; coordination meetings to
facilitate detailed design documentation
including field installation of components
into existing enclosures, PLC I/O and control
interface schematics, and communication
and conduit routing diagrams; construction
of new control, communication, and SCADA
systems; coordination of shutdown and
cutover procedures, field installation, and
startup; and testing and training.
Electrical/instrumentation engineer for
Clean Water Services, Rock Creek Advanced
Wastewater Treatment Facility Gravity
Thickeners. The project involved
constructing four new gravity thickeners in
an operating plant and included a major
480V ductbank relocation; addition of MCC
sections for VFD and FV motor controls,
addition of a control panel with an Allen-
Bradley ControlLogix PLC and integration
into the plant SCADA, and instrumentation
for flow, level, pressure, and temperature.
The project also included modifications to
solids processes and systems with complex
sequencing of installation and startup so as
not to interrupt treatment plant operations.
Electrical/instrumentation and controls
manager for the Placer County Water
Agency, California, Bella Tuscany Pipeline
and Tank, which included a solar powered
tank control panel and turnout control
panel. The tank control panel has a solar
load controller, battery controller, 120VAC
inverter, and solar array meeting NEC 690
requirements. The turnout control panel has
controls for a pressure control valve with
flow calculation capabilities and a PLC with
leased line modem communications; motor
controls for an irrigation pump and power
distribution for the cathodic protection
system; control panels with Allen-Bradley
ControlLogix PLCs and Allen-Bradley HMI;
radio and CSU/DSU communications with
modifications to the existing SCADA system;
solar, battery, uninterruptible power supply,
and inverter load and runtime, seismic, and
wind load calculations; and power, control,
and communication interconnection
diagrams, testing, and training.
Electrical/instrumentation and controls
manager/supervisor for the City of West
Sacramento, California, Lift Stations
Upgrade, which involved rehabilitation of 11
sewer lift stations and installation of a new
SCADA system. The project included 480V
and 240V utility switchboards with
automatic transfer switch, surge protective
device, and power monitors; MCCs with
VFDs and RVSS motor controls; control
panels with TESCO L2000 PLCs and Ethernet
radio communications to a new RSView
SCADA system; field instrumentation
including flow, level, pressure, O2 and H2S
gas monitoring; coordination of intrinsically
safe requirements; and power, control, and
communication interconnection diagrams,
testing, training, and final documentation.
Electrical/instrumentation engineer for
the City of Martinez, California, Electrical
Power Distribution Upgrades. The project
involved replacement of major electrical
distribution equipment, including PG&E
main service transformer and associated
service conductors on the transformer
secondary, main switchboard, four in-plant
MCCs, 100-kVA transformer, and feeder
conductors and conduit between the main
switchboard and downstream MCCs and
equipment. The project also included
implementation of a load-shedding scheme
and complex sequencing to reduce facility
downtime and ongoing.
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Education
BS Civil Engineering,
University of Utah, 1987
Licenses
Civil Engineer, California,
Nevada
Eric T. McGrath, P.E.
Eric McGrath is a civil engineer with more than 32 years of experience that includes
management of construction plan and specification development for a variety of
water and wastewater civil engineering projects.
Relevant Project Experience
Project manager for the Washoe
County, Nevada, Collection System Flow
Monitoring, Hydraulic Modeling, and
Arsenic Identification Plan. Responsible for
coordinating project execution and
subconsultant activities for flow and water
quality investigation of the South Truckee
Meadows Water Reclamation Facility and
Spanish Springs service areas. A detailed
analysis of storm impacts, infiltration, and
inflow in the identified services areas was
necessary to address current flow and water
quality issues and to ensure adequate
conveyance capacity is available as new
growth occurs in Washoe County.
Project engineer for the City of Riverside,
California, Comprehensive Wastewater
Master Plan Update. The update involved
flow monitoring, flow and process
modeling, condition assessment, Waste
Discharge Requirements GAP Analysis, and
development of a capital improvement plan
for the collection system. Developed flow
allocations for computer modeling flow
simulations.
Project engineer for the Contra Costa
Water District, California, Treated Water
Renewal and Replacement Study Update
Asset Management Plan. Developed
planning level cost estimates for water
system improvement projects.
Project manager for the City of Millbrae,
California, Madrone Pump Station
Rehabilitation and Preliminary Design.
Project manager for the County of
Washoe, Nevada, Pleasant Valley
Interceptor 3 Predesign. Coordinated
project execution and subconsultant
activities for preliminary design and 30-
percent cost estimates for two alternatives
recommended in the alternatives study.
Staff engineer for the Central Contra
Costa Sanitary District, California, Collection
System Master Plan. Developed planning
level cost estimates for wastewater
collection system improvement projects.
Quality manager for the Barrick Gold
Corporation’s Cortez Hills Water
Management Plan Delivery and Disposal
Detailed Design in Elko, Nevada.
Responsible for construction plan and
specification review for pump station and
conveyance pipeline design.
Quality manager for the Barrick Gold
Corporation’s Water Management Portfolio
Studies in Elko, Nevada. Responsible for
review of pump station and conveyance
pipeline design concepts.
Design manager/construction manager
for the Poggemeyer Design Group, Inc. in
Reno, Nevada, from 2009-2016. Served as
design manager for Poggemeyer Design
Group (planning/design parent firm) and
construction manager for its subsidiary
construction management group,
CMWorks. Responsibilities primarily
included management of construction plan
and specification development for a variety
of civil engineering project types. Also
served as water/wastewater planning and
design lead for the western U.S. Region.
Representative projects include:
Apex Wastewater Collection System,
City of North Las Vegas, Nevada.
San Clemente Island Wastewater
Treatment Plant and Recycled Water
System, U.S. Navy, California.
Paradise Hills Pressure Zone
Conversion, City of Henderson, Nevada.
Weber Dam Modifications Phases 2
and 3, Bureau of Indian Affairs/Walker
River Paiute Tribe, Nevada.
While with the Poggemeyer Design
Group, served as Profit Center Managing
Leader co-leading with the Profit Center
Practice Leader an engineering group of 29
employees. Primary responsibility was
financial performance of the engineering
Eric T. McGrath, P.E.
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design group, including managing budgets,
monitoring work in progress, optimizing
labor utilization, and other responsibilities to
ensure profitability. Additional
responsibilities included business
development of water and wastewater
clients and project management of water
and wastewater projects. Representative
projects include:
Export Sewer Pump Station Master
Plan, North Tahoe Public Utility District,
California.
Recycled Water Facilities Master Plan,
South Tahoe Public Utility District,
California.
North Virginia Sanitary Sewer
Interceptor Phase 1, City of Reno
Department of Public Works, Nevada.
Branch manager for AMEC
Infrastructure, Inc. in Reno, Nevada from
2003-2005. Managed the Reno office, which
included approximately 15 people.
Responsible for all office objectives and
operations, including profitability, business
development, personnel management, and
project execution. Representative projects
include:
North Spanish Springs Floodplain
Detention Facility, Washoe County
Department of Water Resources,
Nevada.
High Desert State Prison Wastewater
Treatment Plant Improvements, Nevada
State Public Works Board, Nevada.
Water Treatment Plant Study,
Kingsbury General Improvement District,
Nevada.
Reclaimed Water System
Improvements, City of Sparks, Nevada.
Project manager for Kennedy/Jenks
Consultants in Reno, Nevada from 1995-
2003. Hired as a project engineer and was
soon promoted to project manager.
Managed multi-engineering discipline
projects primarily in municipal water and
wastewater. Assisted in office management
duties and business development activities.
Representative projects include:
Susanville Wastewater Treatment
Plant Expansion, Susanville Consolidated
Sanitary District, California.
Cold Springs Wastewater Treatment
Plant Facility Planning, Washoe County
Department of Water Resources,
Nevada.
Ely Wastewater Treatment Plant
Expansion, City of Ely, Nevada.
Supervisor for the City of Los Angeles
Department of Water and Power from 1987-
1995. For the first two, years served as a
construction inspector on large water
system projects. For the second two years,
served as project engineer performing civil
and structural engineering design. For the
final four years, supervised an engineering
design group consisting of two engineers,
two surveyors, and a drafter. Representative
projects include:
Bishop Fuel Facility for fleet vehicles.
Haiwee Reservoir Improvements,
which included modifications necessary
for reduced maximum storage level.
Los Angeles Reservoir Pump Station,
which was a large 200-cfs pump station.
Maclay Tanks, which were twin 10-
million-gallon pre-stressed concrete
tanks.
KEVIN A. HEENEY, PLS
Vice President
California Licensed Land Surveyor, P.L.S. 5914
For 43 years, Kevin has been involved with various aspects of the surveying and mapping profession. He has been licensed
since 1988 and practicing in the Greater Sacramento region. Previous work experience has provided him the opportunity to
successfully complete surveying and mapping projects throughout the State of California. As a Principal Surveyor, Kevin
draws on this experience, his knowledge of technologies and his project management skills to ensure that projects are
successfully completed, on time and on budget.
KEY PROJECTS EXPERIENCE
PUBLIC WORKS/WATER-WASTEWATER
SPA Recycled Water Project, SRCSD
EchoWater Project, SRCSD
San Mateo WWTP 20 Year Master Plan
California Men’s Colony UV Disinfection Design Project
Lower Northwest Interceptor: 17.1 mile sewer interceptor and structures; mapping, right of ways, monitoring and
construction layout.
South Interceptor-Mather Interceptor: 11 mile sewer interceptor; topographic mapping and right of ways
Deuel Vocational Institute: Wastewater Treatment Plant Modifications; mapping and Due Diligence documents
Sacramento River/Fairbairn Wastewater Treatment Plants: Rehabilitation projects; topographic mapping
PUBLIC WORKS/LEVEES
Feather River, Yuba County: 13.5 miles of new levee construction and reinforcement; land net and right of ways
Bear River, Yuba County: 2.5 miles of levee reinforcement and improvements; land net and right of ways
Yuba River, Yuba County: 5.5 miles of levee reinforcement and improvements; land net and right of ways
West Sacramento/Yolo Basin Wetlands: Yolo Bypass, Tisdale Weir, American River and Sacramento River sites;
topographic mapping, soundings, cross sections and structure details.
PUBLIC WORKS/TRANSPORTATION
SR 88 Pine Grove, CA: Aerial survey control, topographic design surveys, land net/base mapping
SR12-SR26 Valley Springs, CA: topographic surveys, land net and right of ways
Silver Dove Way, Morrison Road & Tierra De Dios: 1.4 miles of roadway; land net and right of ways
Maybert Bridge Replacement Project: Topographic mapping, land net and right of ways
McKinley Avenue Bridge: hydrological cross sections
LAND DEVELOPMENT AND SUBDIVISIONS
Valley View, El Dorado County, CA: 2,000 unit single family project
Euer Ranch, El Dorado County, CA: 461 unit single family project
Laguna Mirage, Sacramento, CA: 153 unit cluster home project
Carson Creek Ranch, El Dorado County, CA: 1,700 unit single family/senior project
Town Center East and West, El Dorado Hills, CA: Commercial, retail and office development.
La Crescenta Condominiums, Cameron Park, CA: Condominium conversion project
Pearl Place Condominiums, Shingle Springs, CA: Condominium project
ALTA/ACSM LAND TITLE SURVEYS
University of California, Merced Campus: 10,000+ acres including topographic surveys, Record of Survey and exhibits.
Von Housen Mercedes Benz, Sacramento, CA: Auto dealership and adjacent office building
Residence Inn, Rancho Cordova, CA: Hotel site and off-site easement documentation
Rocklin Pointe, Rocklin, CA: Shopping center
Anderson Marketplace, Anderson, CA: Shopping center
SPECIAL PROJECTS
Young vs. Lungren: Expert witness consultation related to easement litigation
Nixon vs. Snoke: Forensic surveys related to accident litigation
Tule River Indian Reservation: Establishment of geodetic control for future projects
EDUCATION
California State University, Chico, California - Engineering, Industry and Technology - 1973-1975
PROFESSIONAL AFFILIATIONS
Surveyors, Architects, Geologist and Engineers (SAGE) of El Dorado County
California Land Surveyor’s Association
“Protecting the infrastructure through innovative
Corrosion Engineering Solutions”
SUMMARY
Over thirty-five (35) years of experience in all phases of corrosion projects including
design engineering, manufacturing, research and development, construction
inspection services, construction management, sales and marketing and litigation
expert witness. Have successfully worked with clients in the fields of aerospace,
marine, petroleum, chemical, mining and minerals, water and wastewater treatment
and transmission, electric power industry, transportation systems, municipalities and
state and federal government agencies. Established a proven track record for the
ability to manage and direct complex research and design projects, requiring the
coordination of strict budgets and demanding schedules with engineering staff and
project teams.
Special areas of expertise include cathodic protection design, installation, monitoring,
troubleshooting, surveying, adjusting and repairing for underground pipelines, pile
supported structures, seawalls, retaining structures, marine vessels, storage tanks,
condenser water boxes, cooling water lines, intake structures, traveling screens and
water wells . Additional expertise in condition assessments of water/wastewater treat-
ment facilities and the diagnosis of internal and external corrosion problems associat-
ed with copper piping systems such as thermogalvanic corrosion, high temperature
corrosion, velocity related corrosion and corrosion related to cold water pitting phe-
nomena, failure analysis of building plumbing systems, conducting soil corrosivity stud-
ies, expert witness for litigation support.
PUBLICATIONS & SEMINARS
► Ali, M. & Howard Jr., J.D. Corrosion Investigation of Steel H-Piles. NACE Corrosion
Conference 1990.
► California State Water Resources Control Board, Seminars throughout state, “Corrosion
and Corrosion Control for Underground Storage Tanks ”, 1994-1995.
► Cal/Nev Section of AWWA, Fall Conference, 1994-1995, “Corrosion Control for Water
Wells”.
► San Francisco Bay Area NACE Conference, August, 1996, “Corrosion Concerns of
the Water Industry”.
► California Water Environment Association, Northern Regional Conference, Sept., 1996,
“Metal Selection and Corrosion Control for Water and Soil Environments ”.
► American Society of Civil Engineers, Bay Area Geotechnical Committee, April 1999,
“Guidelines for Soil Corrosivity Testing and Laboratory Analysis ”.
► East Bay Engineers Society, Fairfield, CA, Spring 2004 “What All Civil Engineers
Should Know About Corrosion and Corrosion Control”.
► NACE Western Area Conference, Oct. 2008 “How to Conduct an Evaluation of
Asbestos-Cement Pipe”.
► NACE Western Area Conference, Oct. 2008 “Case Study of Prestressed
Precast Concrete Pile Failures”.
EDUCATION
Bachelor of Science –
Civil/Structural Engineering,
University of Florida
MBA Courses (2 years) -
Northern Illinois University
REGISTRATIONS
► Registered Professional Civil Engineer, CA
(C44435)
► Registered Professional Corrosion
Engineer, CA (CR1055)
► Registered Professional Civil Engineer, NV
(019295)
► Registered Professional Engineer, IL
(inactive)
EXPERIENCE
President/Owner
JDH Corrosion Consultants, Inc.
Concord, CA
1995 – Present
District Manager
Corrpro Companies
Hayward, CA
1992 – 1995
President
Corrosion Engineering & Research Co.
Concord, CA
1987 – 1992
Design/Project Engineer
Chicago Bridge & Iron Company
Oakbrook, IL & San Francisco, CA
1977 – 1985
“Protecting the infrastructure through innovative
Corrosion Engineering Solutions”
(Continued)
RELEVANT CONDITION ASSESSMENT PROJECT EXPERIENCE
Project Name Agency Brief Description of Project Scope of Work
Concrete Condition
Assessment of Head-
works
Delta Diablo Sanita-
tion District
Conducted an inspection of the Screen Channel No. 1, Influent
Pipe from MH-1 and Grit Chamber Pump Room at the main
wastewater treatment facility located in Antioch, CA.
Condition Assessment
Central Contra Costa
Sanitary District Main
Wastewater Treatment
Plant
CCCSD Conduct a condition assessment of the following structures:
Influent diversion struture
Headworks metallic equipment
Pre-aeration tank #1 & #2
Primary Sedimentation Tanks #1, #2 & #3
Distribution channels north and south
60-inch Primary effluent pipeline and associated structures
OC Building Facade
72-inch PE Pipeline
Secondary Clarifiers North Nos. 1 - 4
Secondary Clarifiers South Nos. 1 – 4
Aeration Basin #2 AB
Wet Well No. 2
Five Wet Wells at
Pump Stations
South Tahoe PUD Performed an on-site corrosion evaluation of the subject rein-
forced wet wells for the purpose of assessing the extent and
degree of any deterioration of the structures in order to determine
the current condition of the structures as well as if repair work
was warranted. We inspected both the wet side and dry side of
the pump station.
Arden Pump Station Regional San A condition assessment of the wet well was performed on all of
the wet well including influent channels, sluice gates, hand rails,
concrete walls, manholes, and various appurtenances.
San Mateo Wastewater
Treatment Plant
City of San Mateo Performed a condition assessment of the reinforced concrete that
is exposed to wastewater in the Influent J-Box and provided rec-
ommendations for remedial repair work based on findings.
Thickeners Nos. 1 & 2 USD Inspected the interior of both thickeners and made recommenda-
tions for repair and recoating the thickeners
Force Main Sewer Authority Mid-
Coastside
Conducted a condition assessment of a force main for SAMC.
This assessment included an excavation and inspection of the
Force Main.
Force Main Rodeo Sanitary Dis-
trict
Conducted a condition assessment of a force main for RSD. This
assessment included an excavation and inspection of the Force
Main.
Condition Assessment
33-inch & 39-inch Di-
ameter Sewer Force
Mains
USD Conducted a condition assessment of 66,700 feet of 33-inch and
39-inch diameter force mains owned and operated by Union San-
itary District. These force mains were installed in 1982 and they
convey raw wastewater from the Irvington Pump Station to the
Newark Pump Station and on to the Alvarado Wastewater Treat-
ment Plant in Union City, CA.